Mozilla

iPhone Duo UI bug

Mozilla Connect — 2026-11-11T15:25:59+00:00

Please fix view at main screen. It’s terrible.

When configured to restore previous sessions, Firefox now restores windows to their saved...

Nightly Release Notes — 2026-11-11T13:32:13.960726+00:00

162.0a1 / Fixed / Bug 2064100 When configured to restore previous sessions, Firefox now restores windows to their saved positions on GNOME 51 and later, matching existing support on KDE Plasma 6.8+.

Fixed Firefox for Android not switching between light and dark theme to match the device if the...

Nightly Release Notes — 2026-11-11T13:30:34.598261+00:00

162.0a1 / Fixed / Bug 1813529 Fixed Firefox for Android not switching between light and dark theme to match the device if the setting changed while Firefox was still open.

Fixed some images on Firefox for Android not showing the image description when long-pressing the image.

Nightly Release Notes — 2026-11-11T13:29:37.186291+00:00

162.0a1 / Fixed / Bug 2003625 Fixed some images on Firefox for Android not showing the image description when long-pressing the image.

Fixed context menu items sometimes appearing blank, without their labels, after Firefox was updated.

Nightly Release Notes — 2026-11-11T13:27:14.944889+00:00

162.0a1 / Fixed / Bug 2034677 Fixed context menu items sometimes appearing blank, without their labels, after Firefox was updated.

Review extension access before opening sensitive account pages

Mozilla Connect — 2026-11-11T09:57:09+00:00

Could Firefox make it easier to review extension access for a specific site before opening an account page? Consider someone visiting an email account, a banking site, or a crypto account such as BYDFi. The useful browser-level question is which installed extensions have permission to read or change content on that particular site. A quick, understandable review could help people make a more informed choice before signing in. The workflow I would like to discuss is a site-specific extension acce

Thunderbird password pretty useless because program opens without it

Mozilla Connect — 2026-11-11T09:39:02+00:00

Why bother with a password if anyone can read all your past messages without it? All it does is prevent you getting new ones. Thunderbird shouldn't open at all if the password isn't entered. I realize using the PW doesn't encrypt the messages storage, so someone could examine the mbox files, etc. But I'm just thinking about a casual, non techie snooper.

Recently closed tabs

Mozilla Connect — 2026-11-11T08:55:35+00:00

As per screenshot above, each tab has a "X" which allows you to close/remove it from that list. It would be appreciated if the Devs could add an option to close/remove ALL of them in one go .. On this specific page for that matter. ... So consider a delete all" or "close all" button Thanks Jigs

Why Does Sync Not Sync?

Mozilla Connect — 2026-11-11T04:28:25+00:00

I open settings on my desktop, it only shows this device, says sync is on, and then "Connect another device"! And shows no other device. So how is Sync On if there's no other devices to sync to?? So I click on "Connect another device", I select "Already have Firefox for mobile", then a popup says "Sync Firefox on your phone or tablet", Says to open Firefox, go to menu & tap "Sign in"! Then I should scan the QR code shown. Well, there is no SIGN IN on any menu, as I get signed in automatically

Fixed address bar results covering the address bar in macOS full screen when the menu bar was revealed.

Nightly Release Notes — 2026-11-11T04:19:28.245363+00:00

162.0a1 / Fixed / Bug 2077597 Fixed address bar results covering the address bar in macOS full screen when the menu bar was revealed.

Starting with Firefox 161, Firefox Nightly supports the CSS margin-trim property for block...

Nightly Release Notes — 2026-11-11T04:18:42.411922+00:00

162.0a1 / Web Platform / Bug 2051240 Starting with Firefox 161, Firefox Nightly supports the CSS margin-trim property for block containers, which removes the margins of child elements at the container's edges.

Where Can I Find Reliable Online Quran Classes for Kids?

Mozilla Connect — 2026-11-11T04:12:20+00:00

Finding a reliable online Quran academy for children can be challenging, especially when parents want qualified teachers and flexible class timings. One-on-one classes are a great option because children receive individual attention and can learn at their own pace. I recently came across Quran Experts , which offers live online Quran classes for kids and adults. Their courses include Noorani Qaida, Quran Reading with Tajweed, Hifz, and Islamic Studies. They also provide three free trial classes,

Google Summer of Code 2026 results

Planet Mozilla — 2026-11-11T00:00:00+00:00

The Rust Project participated in Google Summer of Code (GSoC) for the third time this year. This time we had 13 projects, and our dear contributors have been working very hard on them for several months. As usual, the projects had various durations, so while some of them have ended in August, the last one has only finished in November, so we have been waiting until we have all the results before publishing this blog post. We are very happy to announce that all 13 projects were successful and pas

make games

Mozilla Connect — 2026-11-10T18:48:27+00:00

make games

Open research, stronger privacy: Making Firefox users harder to fingerprint

Planet Mozilla — 2026-11-10T18:36:02+00:00

Firefox is strengthening protection against trackers that recognize you across websites, even when they don’t use cookies. The latest fingerprinting protections shipped in Firefox reduce the extractable distinguishing details, making … Read more The post Open research, stronger privacy: Making Firefox users harder to fingerprint appeared first on Mozilla Security Blog.

a follow-up question google AI causes the left panel to move too far to the right and covers up the left part of the text of the AI second response

Mozilla Connect — 2026-11-10T17:47:42+00:00

a follow-up question google AI causes the left panel to move too far to the right and covers up the left part of the text of the AI second response

youtube and mozilla does n t working ( oS ventura )???

Mozilla Connect — 2026-11-10T17:35:44+00:00

idea??

From Research to Prototype: Testing the New Desktop Settings

Thunderbird Blog — 2026-11-10T15:10:23+00:00

In the last update, the team shared ongoing work around removing technical jargon and adopting plain language so everyone can navigate settings with ease. Those initial content refinements have rolled out into Thunderbird already (v160). Following those copy updates, the team ran research to evaluate how settings information is structured. Below is a breakdown of […] The post From Research to Prototype: Testing the New Desktop Settings appeared first on The Thunderbird Blog .

Firefox’s free built-in VPN uncaps data limit through January 2027

Mozilla Blog — 2026-11-10T14:00:00+00:00

Whether you’re heading home to see family this winter or taking a well-earned break before the year wraps up, we want you to browse with a little more peace of mind. That’s why, as our gift to you, everyone using Firefox’s free built-in VPN gets unlimited data starting today, November 10, through January 31, 2027. […] The post Firefox’s free built-in VPN uncaps data limit through January 2027 appeared first on The Mozilla Blog .

How Do ICO Development Services Manage Vesting Risks?

Mozilla Connect — 2026-11-10T12:19:41+00:00

Token Vesting Risks may have an influence on investors' confidence and financial stability of the market in case the team, advisers or early investors receive token allocations without any conditions on their release. The use of a well-designed vesting schedule will allow you to avoid token rushes and get more understanding regarding when and how allocated tokens will be unlocked. ICO development services will help you to manage vesting risks by determining release dates, lockup periods and allo

How Do Unity Developers Manage Complex Game Mechanics?

Mozilla Connect — 2026-11-10T12:04:37+00:00

Handling of the mechanics of the game involves the planning of gameplay rules, coding, and testing of system integrations. Multiplayer actions, character movements, collision detection, and physics are among features that should work properly in the course of the game. A Unity Game Development Company can split the mentioned mechanics into separate modules for coding and debugging. Developers may use Unity's physics engine, animation, and C# scripts to manage character actions and object interac

stocks widget broken

Mozilla Connect — 2026-11-10T10:52:07+00:00

Hello all, It seems that the stocks widget is broken after the last update: I added tickers to follow in the search but the stocks do not show up in the overview (despite the are marked with a check mark). Just yesterday it still worked. Maybe someone could have a look at it. Best wishes, RQ

"See Details" on flagged extensions doesn't provide ANY details...

Mozilla Connect — 2026-11-10T00:20:29+00:00

"See Details" on flagged extensions doesn't provide ANY details. It forwards to a generic webpage with explanations as to why an extension might get flagged. Not helpful. "See Details" should provide... you know... DETAILS. I want to know specifically why a plugin is flagged. Is it monetizing? redirecting? scraping? logging? insecure? violating specific ToS of some other website? WHAT? I mean, it's flagged, so mozilla knows why it's flagged. Why don't I?

Firefox 115.45.0esr

Release Notes — 2026-11-10T00:00:00+00:00

Firefox 115.45.0esr release notes.

Firefox 160.0

Release Notes — 2026-11-10T00:00:00+00:00

Firefox 160.0 release notes.

Firefox for Android 160.0

Android Release Notes — 2026-11-10T00:00:00+00:00

Firefox for Android 160.0 release notes.

theme bug on widescreen

Mozilla Connect — 2026-11-09T22:33:06+00:00

theme bug on widescreen (3440x1440) https://i.imgur.com/FbEho5X.png left side

felling happy

Mozilla Connect — 2026-11-09T20:14:04+00:00

sorry for some error in my first post I was a little bit nervous, but at the same time I feel very happy to be here, and start something fresh, I like to explore new things, fresh ideas or new people I am very open to listen and learn from others,

connect

Mozilla Connect — 2026-11-09T19:58:16+00:00

thanks Jon for your warm welcome, hi everyone I am Germbour631 and I am new here to connect and meet new friends, so we share ideas to each other, I am new i don't know who to address, but if open the door for I will comes in thanks.

Android UI looks like garbage

Mozilla Connect — 2026-11-09T19:49:16+00:00

I just want to say the Firefox UI looks like **bleep** on Android, I had to root which lead to a factory wipe and I almost threw up when I saw the current Firefox UI. I downloaded and sketchy apk for a year-old version and am going to run that without updates going forward in perpetuity. I don't know why everything is so round and I don't know who came up with the idea the ... Menu should expand at the bottom of the page but they belong in a death camp. Please fix your UI Thanks

Mozilla's Double Standards: Privacy for Some, Exclusion for Millions of Iranians

Mozilla Connect — 2026-11-09T19:34:12+00:00

Dear Mozilla Team, I am writing to express my anger and deep disappointment regarding Mozilla's decision to make Firefox's built-in VPN unavailable to users in Iran. Let me be clear: people in Iran are already struggling with constant internet restrictions, censorship, filtering, and limitations imposed by their own government. Access to a free and open internet is not something we take for granted. It is something we have to fight for every single day. And now, Mozilla, an organization that fre

Multiple Profiles

Mozilla Connect — 2026-11-09T15:19:04+00:00

I'd like to report This happens on several occasions, in which, I only have 2 profiles and one lags and gives me delays, and its because the other profile is shoeing that it is being updated in antoher instance.... but both are on the same version, i've enclosed snapshots.

Firefox now supports streaming uploads with the Fetch API, allowing web applications to send...

Nightly Release Notes — 2026-11-09T15:05:13.979958+00:00

162.0a1 / Web Platform Firefox now supports streaming uploads with the Fetch API , allowing web applications to send request bodies incrementally using a ReadableStream without buffering the entire body first.

Firefox now supports the CSS Typed OM Level 1 specification, allowing web applications to read...

Nightly Release Notes — 2026-11-06T21:33:20.488027+00:00

162.0a1 / Web Platform / Bug 2089681 Firefox now supports the CSS Typed OM Level 1 specification, allowing web applications to read and write CSS values as typed JavaScript objects rather than strings. The color value interfaces are not yet available.

Starting with Firefox 162, Firefox Nightly now supports the ident() arbitrary substitution...

Nightly Release Notes — 2026-11-06T02:45:42.354951+00:00

162.0a1 / Web Platform / Bug 2088337 Starting with Firefox 162, Firefox Nightly now supports the ident() arbitrary substitution function, which allows authors to dynamically construct identifiers by concatenating other values. The ident() function can be used wherever an is accepted.

Fixed the Developer Tools eyedropper showing the wrong colors after the page is scrolled.

Nightly Release Notes — 2026-11-05T13:58:39.942518+00:00

161.0a1 / Developer / Bug 1377755 Fixed the Developer Tools eyedropper showing the wrong colors after the page is scrolled.

Starting with Firefox 161, Firefox Nightly for Android can read web pages in Reader view aloud...

Nightly Release Notes — 2026-11-05T12:45:19.461316+00:00

161.0a1 / New / Bug 2084126 Starting with Firefox 161, Firefox Nightly for Android can read web pages in Reader view aloud with Listen to Page .

Starting with Firefox 161, the address bar in Firefox Nightly explains why some results are...

Nightly Release Notes — 2026-11-05T07:57:44.884150+00:00

161.0a1 / New / Bug 2086462 Starting with Firefox 161, the address bar in Firefox Nightly explains why some results are shown, such as when a page was last visited or bookmarked.

September in Servo: , rounded rectangles, and more!

Planet Mozilla — 2026-11-05T00:00:00+00:00

Servo 0.7.0 contains all of the changes we landed in September, spanning 527 commits! The developer tools console now eagerly evaluates JS inputs, allowing faster feedback (@freyacodes, #47527). We’ve shipped new web platform features: the :checked pseudoclass (@skyz1, #47987) the user-select property (@SimonSapin, @mrobinson, #48137, #48242) the element (@rayguo17, #46974) CSS typed arithmetic (@Loirooriol, #48338) the alpha() CSS function (@Loirooriol, #48344) the font-width property (@Loi

Browsing history imported from Chrome now includes how often you visited each page, so the sites...

Nightly Release Notes — 2026-11-04T17:59:14.352282+00:00

161.0a1 / Changed / Bug 1421485 Browsing history imported from Chrome now includes how often you visited each page, so the sites you use most rank higher in address bar suggestions and shortcuts.

Firefox Profiler Deployment (November 4, 2026)

Planet Mozilla — 2026-11-04T13:13:40+00:00

The latest version of the Firefox Profiler is now live! Check out the full changelog below to see what’s changed: Changes: [Markus Stange] Some FlameGraph changes, for the function list flame graphs (#6402) [Markus Stange] Match source-mapped original filenames in call tree search (#6431) [fatadel] Automate production deployments (#6304) [Markus Stange] Fix source map symbolication in the presence of path collisions (#6432) [Markus Stange] Apply the 30s timeout to CLI integration tests (#6434)

This Week in Rust 676

Planet Mozilla — 2026-11-04T05:00:00+00:00

Hello and welcome to another issue of This Week in Rust! Rust is a programming language empowering everyone to build reliable and efficient software. This is a weekly summary of its progress and community. Want something mentioned? Tag us at @thisweekinrust.bsky.social on Bluesky or @ThisWeekinRust on mastodon.social …

Happy BMO Push Day! (20261103.1)

Planet Mozilla — 2026-11-03T22:05:48+00:00

Github Link The following changes have been pushed to bugzilla.mozilla.org: Bug 2087000 - Sometimes phab “last modified” timestamp updates without actual changes to the revision Bug 2081860 - Migrate Bug REST resource to native Mojo API: bug objects (get, search, create, update, possible_duplicates, history) Bug 2070239 - Add DB-backed tests for flag-event bugmail recipient selection (prev-status tie-break, flag-type cc_list) Bug 2082543 - Clean up after the REST-to-Mojo migration: shared helpe

MozPhab 2.24.0 Released

Planet Mozilla — 2026-11-03T14:49:08+00:00

Bugs resolved in Moz-Phab 2.24.0: bug 2078583 moz-phab reorg --force can fail part way and leave the Phabricator stack tangled bug 2082342 Move lando warnings knowable at submit time to moz-phab bug 2086803 Resolve each command’s flags and config into a frozen options object bug 2087605 moz-phab will break with upcoming jj release 0.47 bug 2087877 Remove args from the VCS layer bug 2088194 Update hard-coded Lando-dev urls to point to Fastly WAF fronted domains Discuss these changes in #enginee

Significantly improved rendering performance for backdrop-filter on certain Android devices.

Nightly Release Notes — 2026-11-03T10:26:00.855308+00:00

161.0a1 / Fixed / Bug 2079476 Significantly improved rendering performance for backdrop-filter on certain Android devices.

Announcing rustup 1.29.3

Planet Mozilla — 2026-11-03T00:00:00+00:00

The rustup team has published a new point release of rustup, 1.29.3. Rustup is the recommended tool to install Rust, a programming language that empowers everyone to build reliable and efficient software. What's new in rustup 1.29.3 This new patch release has fixed some minor regressions over the previous one: Fixed "Illegal instruction" error on certain x86_64 CPUs without SSE4.1. pr#5162 Fixed "lock() not supported" error on Solaris. pr#5167 Further details are available in the changelo

Firefox 159.0.1

Release Notes — 2026-11-03T00:00:00+00:00

Firefox 159.0.1 release notes.

Firefox for Android 159.0.1

Android Release Notes — 2026-11-03T00:00:00+00:00

Firefox for Android 159.0.1 release notes.

Firefox Security & Privacy Newsletter 2026 Q3

Planet Mozilla — 2026-11-02T23:00:00+00:00

Welcome to the Q3 2026 edition of the Firefox Security & Privacy Newsletter. Security and privacy are core principles of Mozilla’s Manifesto and remain at the heart of Firefox’s development. This edition highlights key initiatives from Q3 2026 across three areas: Firefox Security: New security features, platform improvements, hardening efforts, and security integrations in Firefox. Firefox Privacy: New privacy features, enhanced protections, and privacy integrations in Firefox. Community Engage

Starting with Firefox 161, Firefox Nightly supports the CSS text-autospace-size property, which...

Nightly Release Notes — 2026-11-02T09:48:09.255825+00:00

161.0a1 / Web Platform / Bug 2086765 Starting with Firefox 161, Firefox Nightly supports the CSS text-autospace-size property , which sets the width of the space text-autospace: normal adds between ideographic text, such as Chinese or Japanese, and other text.

Firefox now supports nested arbitrary substitution functions in the primary parameters of var(),...

Nightly Release Notes — 2026-11-02T08:49:57.017882+00:00

161.0a1 / Web Platform / Bug 2080511 Firefox now supports nested arbitrary substitution functions in the primary parameters of var() , attr() , and env() ; for example, var(attr(data-theme-prop type())) and env(var(--safe-area-block-start)) .

Tab groups are now listed in the application menu, making it easier to find and reopen them.

Nightly Release Notes — 2026-11-02T08:41:33.285442+00:00

161.0a1 / New / Bug 2048790 Tab groups are now listed in the application menu, making it easier to find and reopen them.

Fixed typing with an input method, such as for Japanese or Korean, stopping after the first...

Nightly Release Notes — 2026-11-02T08:32:09.847905+00:00

161.0a1 / Fixed / Bug 2077043 Fixed typing with an input method, such as for Japanese or Korean, stopping after the first character in Canva Docs.

'Trust but verify'; or, 'the correctness ratchet'

Planet Mozilla — 2026-10-30T00:00:00+00:00

The name of the game in agentic development is figuring out how to clearly tell agents what you want– and then how to be sure they follow through. Lately I’ve been tinkering with an interesting technique around this that I’d like to share.1 I call it “trust but verify”2. The basic idea is that sometimes you have things you want to “verify” but they can’t really be mechanistically checked. In that case, you let your agent do its best. But you also have it create an evidence file that contains the

Starting with Firefox 161, the search engine button in the address bar is always visible in...

Nightly Release Notes — 2026-10-29T13:42:19.274314+00:00

161.0a1 / Changed / Bug 2085310 Starting with Firefox 161, the search engine button in the address bar is always visible in Firefox Nightly, not only when the address bar is focused.

Happy BMO Push Day! (20261028.1)

Planet Mozilla — 2026-10-28T21:15:08+00:00

Github Link The following changes have been pushed to bugzilla.mozilla.org: Bug 2081856 - Migrate Bug REST resource to native Mojo API: attachments (attachments, add_attachment, update_attachment) Bug 2080901 - [BMO-ETL] When any table fails to export, the entire snapshot should be rolled back to avoid incorrect results in charts/dashboards Bug 2085028 - log_user_request logs empty request_url/user_agent and server “web” for native Mojo API routes Bug 2067852 - Migrate rst docs to markdown and

Introducing enterprise add-on policies

Planet Mozilla — 2026-10-28T17:14:37+00:00

We are thrilled to announce that enterprise add-ons will launch on addons.mozilla.org (AMO) on December 1, 2026. In response to input from enterprise organizations that distribute add-ons strictly via Firefox … Read more The post Introducing enterprise add-on policies appeared first on Mozilla Add-ons Community Blog.

Firefox DevTools MCP v0.10.7 released

Planet Mozilla — 2026-10-28T11:28:29+00:00

New release of Firefox DevTools MCP. Available on npm at https://www.npmjs.com/package/@mozilla/firefox-devtools-mcp Added New --idle-timeout option (IDLE_TIMEOUT). It sets how many seconds a --connect-existing session waits without tool calls before it releases Firefox. The default stays 1800 seconds (30 minutes). Firefox accepts one client at a time, so a shorter delay lets other clients connect sooner Fixed upload_file_by_uid works again. Since 0.10.5 it did not set any file. It now uses W

This Week in Rust 675

Planet Mozilla — 2026-10-28T04:00:00+00:00

Five Firefox updates you might have missed, and a look ahead

Mozilla Blog — 2026-10-27T13:00:00+00:00

Some of our latest Firefox updates have had big moments of their own, from the launch of our new design and built-in ad blocking on iOS to Firefox Enterprise and our partnership with NVIDIA GeForce NOW. You might’ve even spotted a few familiar internet OGs in our latest campaign. Other improvements might’ve flown under the […] The post Five Firefox updates you might have missed, and a look ahead appeared first on The Mozilla Blog .

Skip the busywork with Smart Window

Mozilla Blog — 2026-10-27T13:00:00+00:00

The days might be getting shorter, but your to-do list is only getting longer. Whether you’re getting a head start on holiday shopping or planning your next career move, Smart Window’s newest features will help you keep up. Firefox’s opt-in AI browsing experience can now use information from tabs you choose to help fill out […] The post Skip the busywork with Smart Window appeared first on The Mozilla Blog .

A Reason for Optimism on US Competition Policy

Planet Mozilla — 2026-10-27T00:05:42+00:00

Mozilla has long called for US antitrust reform in digital markets. After several false starts, real change has yet to materialize. In the meantime, dominant tech players have further entrenched … Read more The post A Reason for Optimism on US Competition Policy appeared first on Open Policy & Advocacy.

Firefox 115.44.0esr

Release Notes — 2026-10-27T00:00:00+00:00

Firefox 115.44.0esr release notes.

Firefox 159.0

Release Notes — 2026-10-27T00:00:00+00:00

Firefox 159.0 release notes.

Firefox for Android 159.0

Android Release Notes — 2026-10-27T00:00:00+00:00

Firefox for Android 159.0 release notes.

Developer Spotlight: Profile Manager Pro

Planet Mozilla — 2026-10-26T22:24:16+00:00

If your online activities involve logging in and out of a lot of different accounts — often on the same website — Profile Manager Pro can be a time-saving game … Read more The post Developer Spotlight: Profile Manager Pro appeared first on Mozilla Add-ons Community Blog.

How to fund Rust contributors

Planet Mozilla — 2026-10-26T00:00:00+00:00

TLDR: To fund general maintenance, donate to the Rust Foundation Maintainers Fund or sponsor the RustNL Maintainers Team To fund specific features and improvements, sponsor fundable Rust Project Goals To fund individual contributors, donate to their GitHub Sponsors accounts There is always so much to do in the Rust Project! New features to implement, bugs to fix, performance optimizations to make, issues to triage… It takes a lot of work to keep our high bar of quality while also shipping new

Firefox reunites meme royalty to remind you what the internet used to feel like

Mozilla Blog — 2026-10-25T11:58:00+00:00

A group of familiar faces from the early web just got back together to ask an important question: What happened to the internet? Sure, there was a time when it was a little less polished, and a lot less speedy, but it was yours. Overly Attached Girlfriend may have wanted to know everything about you, […] The post Firefox reunites meme royalty to remind you what the internet used to feel like appeared first on The Mozilla Blog .

Firefox Profiler Deployment (October 22, 2026)

Planet Mozilla — 2026-10-22T17:01:29+00:00

The latest version of the Firefox Profiler is now live! Check out the full changelog below to see what’s changed: Highlights: [fatadel] Make CompositorScreenshot markers schema-based (#6261) [fatadel] Expose and clear URL-imported call tree search in the CLI (#6387) [Markus Stange] Make the scrollable editor view in the source view cover the full height of the panel, even if the source code is short. (#6405) [Nazım Can Altınova] Add `–js-sources-from-func-names` to `profiler-edit` (#6394) [fata

Three Cheers for Volunteers! – These Weeks in Firefox: Issue 211

Firefox Nightly — 2026-10-22T16:56:55+00:00

Highlights Here are some big-ticket volunteer contributions this week: Thank you to volunteer contributor Cornelius, who made console evaluation able to re-declare let and const variables in our DevTools! Thank … Read more

L10n Report: October Edition 2026

Planet Mozilla — 2026-10-22T16:41:27+00:00

Please note some of the information provided in this report may be subject to change as we are sometimes sharing information about projects that are still in early stages and … Read more

Still here, still yours: 5 reasons to choose Firefox

Mozilla Blog — 2026-10-21T16:00:00+00:00

The internet used to feel like a community, not a commodity. Browsers were tools for exploration, and you could wander the web without feeling tracked everywhere. Today, as the web becomes increasingly surveilled and commercialized, Firefox preserves the magic, freedom, and fun of the early internet. Still open source, still independent, still privacy-focused. No billionaire […] The post Still here, still yours: 5 reasons to choose Firefox appeared first on The Mozilla Blog .

Firefox for Android 158.0.2

Android Release Notes — 2026-10-21T14:06:32.213197+00:00

Firefox for Android 158.0.2 release notes.

Why is the CMA asking us to choose the furniture before the house? The UK’s search choice screens need browser choice screens alongside them

Mozilla Blog — 2026-10-20T07:00:00+00:00

Mobile browsers are a key gateway to the internet for 56 million people in the UK. Smartphone users spend around half an hour a day in these apps, and opening a browser is the most common way they look up information online. Yet most people are using a smartphone browser that was preinstalled and set […] The post Why is the CMA asking us to choose the furniture before the house? The UK’s search choice screens need browser choice screens alongside them appeared first on The Mozilla Blog .

Firefox 115.43.1esr

Release Notes — 2026-10-20T00:00:00+00:00

Firefox 115.43.1esr release notes.

Firefox 158.0.1

Release Notes — 2026-10-20T00:00:00+00:00

Firefox 158.0.1 release notes.

Firefox for Android 158.0.1

Android Release Notes — 2026-10-20T00:00:00+00:00

Firefox for Android 158.0.1 release notes.

This map shows the most important asset that VC-backed companies need right now

Mozilla Blog — 2026-10-16T13:00:00+00:00

What’s the most vital asset for an AI company today? For venture backed AI business, it might be “funding” or “revenue”. But, there’s another asset that’s just as critical: trust. At Mozilla, building technology that people and businesses can genuinely trust has been a long-standing, guiding principle. That’s why we’re supporting the launch of the Trustworthy […] The post This map shows the most important asset that VC-backed companies need right now appeared first on The Mozilla Blog .

What does the (Fire)fox say?

Mozilla Blog — 2026-10-15T16:00:00+00:00

It all started with a question: What does Firefox sound like to you? Over the past year, Mozilla developed a small but meaningful set of sounds to add a sonic dimension to the Firefox experience. When we started this process, we knew we wanted something warm, human, and representative of our open source identity. We […] The post What does the (Fire)fox say? appeared first on The Mozilla Blog .

Mozilla introduces Firefox Enterprise

Mozilla Blog — 2026-10-13T04:01:00+00:00

Institutions are recalculating who controls the technology they rely on. Mozilla has an independent option to offer. For years, organizations consolidated technology around a small number of providers to make things simpler. Fewer systems. Tighter integrations. More economies of scale. But that consolidation went well beyond technology. It consolidated dependency, too. The resulting risks have […] The post Mozilla introduces Firefox Enterprise appeared first on The Mozilla Blog .

Firefox 115.43.0esr

Release Notes — 2026-10-13T00:00:00+00:00

Firefox 115.43.0esr release notes.

Firefox 158.0

Release Notes — 2026-10-13T00:00:00+00:00

Firefox 158.0 release notes.

Firefox for Android 158.0

Android Release Notes — 2026-10-12T16:01:35.230331+00:00

Firefox for Android 158.0 release notes.

Firefox partners with Anschutz Entertainment Group at the Uber Arena and Uber Eats Music Hall in Berlin

Mozilla Blog — 2026-10-08T07:00:00+00:00

Firefox is teaming up with AEG and taking to the main stage at Berlin’s biggest and best indoor arenas. Starting this October, as the indoor music scene heats up and the basketball and ice hockey seasons are in full swing, fans flocking to the Uber Arena, Uber Eats Music Hall, and Uber Platz will see […] The post Firefox partners with Anschutz Entertainment Group at the Uber Arena and Uber Eats Music Hall in Berlin appeared first on The Mozilla Blog .

Jambu Palaniappan and David Parry-Jones join the Mozilla Corporation Board of Directors

Mozilla Blog — 2026-10-07T18:37:41+00:00

Today, we are very pleased to announce two new additions to the Mozilla Corporation Board of Directors: Jambu Palaniappan and David Parry-Jones. As we build the next chapter of Mozilla, we’ve been focused on bringing people onto our Board who combine deep operating experience with a real commitment to the values Mozilla stands for. Jambu […] The post Jambu Palaniappan and David Parry-Jones join the Mozilla Corporation Board of Directors appeared first on The Mozilla Blog .

100 days later: Microsoft still steers Windows and Copilot users to Edge, everywhere the law lets it

Mozilla Blog — 2026-10-07T10:00:00+00:00

One hundred days ago, Mozilla released Over The Edge 2.0, the second independent report from leading experts on deceptive design Dr. Harry Brignull and Cennydd Bowles, on how Windows, Edge, Bing, and Copilot are designed to steer people away from the browser they chose. We published the report, and the researchers published the evidence for […] The post 100 days later: Microsoft still steers Windows and Copilot users to Edge, everywhere the law lets it appeared first on The Mozilla Blog .

Strengthen your online security for free with Firefox

Mozilla Blog — 2026-10-06T16:00:00+00:00

Every October, Cybersecurity Awareness Month reminds us the importance of protecting our digital lives. The theme for 2026 is ‘Don’t Make It Easy for Them,’ with the National Cybersecurity Alliance (NCA) and the Cybersecurity and Infrastructure Security Agency (CISA) providing simple, actionable steps users can take to make it harder for cybercriminals to attack. Everyone […] The post Strengthen your online security for free with Firefox appeared first on The Mozilla Blog .

Firefox 157.0.1

Release Notes — 2026-10-06T00:00:00+00:00

Firefox 157.0.1 release notes.

Firefox for Android 157.0.1

Android Release Notes — 2026-10-06T00:00:00+00:00

Firefox for Android 157.0.1 release notes.

Thunderbird for iOS: A First Look at the Native iPhone Email App in Development

Thunderbird Blog — 2026-10-01T22:14:22+00:00

The team has been working hard behind the scenes laying a strong foundation for the Thunderbird iOS app. Rather than leveraging existing code, we are building natively from scratch. This fresh start allows us to take everything we’ve learned from Thunderbird Desktop and Android to ensure a fast, reliable, and modern experience on your iPhone […] The post Thunderbird for iOS: A First Look at the Native iPhone Email App in Development appeared first on The Thunderbird Blog .

Under the Hood: Prompt tuning Shake to Summarize for recipes

Mozilla Blog — 2026-10-01T16:00:00+00:00

Following the rollout of Firefox’s Shake to Summarize feature to Android devices this May, we wanted to take a closer look at the modeling work behind the feature. In a previous blog post, we discussed our model selection process. Now that Shake to Summarize has been available on both iOS and Android for a few […] The post Under the Hood: Prompt tuning Shake to Summarize for recipes appeared first on The Mozilla Blog .

More modern. More flexible. Still Firefox.

Mozilla Blog — 2026-09-29T13:00:00+00:00

What comes to mind when you think of Firefox? Is it our best-in-class privacy features and ad blocking capabilities? Our partnerships with Wrexham, NVIDIA or Mistral? Or maybe our adorable mascot Kit? If you’ve been following Firefox this year, you’ve seen us add new ways to get things done while giving you more choice over […] The post More modern. More flexible. Still Firefox. appeared first on The Mozilla Blog .

Firefox 115.42.0esr

Release Notes — 2026-09-29T00:00:00+00:00

Firefox 115.42.0esr release notes.

Firefox 140.17.0esr

Release Notes — 2026-09-29T00:00:00+00:00

Firefox 140.17.0esr release notes.

Firefox 157.0

Release Notes — 2026-09-29T00:00:00+00:00

Firefox 157.0 release notes.

Firefox for Android 157.0

Android Release Notes — 2026-09-29T00:00:00+00:00

Firefox for Android 157.0 release notes.

Shoutout to More Layouts – These Weeks in Firefox: Issue 210

Firefox Nightly — 2026-09-28T19:31:43+00:00

Highlights Rév O’Conner added a settings popup to control the layout of the Inspector. “Auto” automatically switches the layout at a given toolbox width. The new sidebar (sidebar.revamp) and switcher … Read more

Classic, Private, or Smart? Choose the right Firefox window for every task

Mozilla Blog — 2026-09-24T17:00:00+00:00

We spend a lot of time browsing online. Whether you are researching for work, planning a trip, paying your bills, or scrolling through social media, your browser is there for it all. While all these tasks are very different in nature, a lot of people still tend to stick to the same window type for […] The post Classic, Private, or Smart? Choose the right Firefox window for every task appeared first on The Mozilla Blog .

Thunderbird Monthly Development Digest: September 2026

Thunderbird Blog — 2026-09-23T22:35:00+00:00

Greetings once more from the Thunderbird development team! As the Northern hemisphere summer comes to an end and a slew of PTO, company holidays and projects have wrapped up, what better time to share progress and next steps on the work the Thunderbird Desktop Engineering team has on their plates!? Exchange support moving well The […] The post Thunderbird Monthly Development Digest: September 2026 appeared first on The Thunderbird Blog .

Firefox 156.0.1

Release Notes — 2026-09-22T00:00:00+00:00

Firefox 156.0.1 release notes.

Firefox for Android 156.0.1

Android Release Notes — 2026-09-22T00:00:00+00:00

Firefox for Android 156.0.1 release notes.

Stay focused wherever you work with Firefox mobile browsers

Mozilla Blog — 2026-09-21T17:00:00+00:00

When it’s Monday morning and you’re on the subway, in a coffee shop, or squeezing in a few email replies after your morning workout, your phone becomes your digital office. But every time you open your browser, you risk getting struck with any combination of distracting ads, auto-playing videos, and open tabs from the previous […] The post Stay focused wherever you work with Firefox mobile browsers appeared first on The Mozilla Blog .

Mila and Mozilla announce new initiative to build trustworthy open source AI for everyone, with Canadian government support

Mozilla Blog — 2026-09-17T19:30:00+00:00

Today at ALL IN, Canada’s largest AI and technology event, Mozilla and Mila announced a new initiative and fresh investment to build an open source AI foundation layer that enables organizations and institutions to own and operate advanced AI systems locally, ensuring full control over their technology and data. Doubling down on its commitment to […] The post Mila and Mozilla announce new initiative to build trustworthy open source AI for everyone, with Canadian government support appeared firs

High-speed Release Trains – These Weeks in Firefox: Issue 209

Firefox Nightly — 2026-09-17T17:14:51+00:00

Highlights Firefox 155 just released! That’s the first release that went through the full 2-week release cycle process. The WebExtensions team added a new backgrounds_area theme property so themes can … Read more

Mozilla and Mistral: Partnering to expand AI competition and preserve user choice

Mozilla Blog — 2026-09-16T08:00:00+00:00

The AI race is shifting. Again. Practically overnight, competition has expanded from “which AI model is best?” to a new high-stakes battle over which models people can access, through which products, and whether people have meaningful choice about AI at all. In response, Mozilla and Mistral today announced a partnership built on a shared idea: […] The post Mozilla and Mistral: Partnering to expand AI competition and preserve user choice appeared first on The Mozilla Blog .

Firefox 115.41.0esr

Release Notes — 2026-09-15T00:00:00+00:00

Firefox 115.41.0esr release notes.

Firefox 140.16.0esr

Release Notes — 2026-09-15T00:00:00+00:00

Firefox 140.16.0esr release notes.

Firefox 156.0

Release Notes — 2026-09-15T00:00:00+00:00

Firefox 156.0 release notes.

Firefox for Android 156.0

Android Release Notes — 2026-09-15T00:00:00+00:00

Firefox for Android 156.0 release notes.

The Need for Speed Controls – These Weeks in Firefox: Issue 208

Firefox Nightly — 2026-09-11T17:32:05+00:00

Highlights Firefox 154 went out today! Lots of goodies in there for our users, including support for NVIDIA GeForce NOW The new 2 week release cycle is now in effect. … Read more

Desktop Settings: Removing technical jargon

Thunderbird Blog — 2026-09-09T15:25:40+00:00

Our goal for this phase of work is to remove the technical jargon, use plain language, and make it effortless for everyone to make informed decisions about their settings. With over 250 blocks of settings content to untangle, we aimed for incremental improvements rather than striving for perfection. While our previous research leaned heavily on […] The post Desktop Settings: Removing technical jargon appeared first on The Thunderbird Blog .

Motion, Colour, Captions, Kit – These Weeks in Firefox: Issue 207

Firefox Nightly — 2026-09-08T18:38:38+00:00

Highlights Want some Kit? Check out the store! Sebastian Zartner [:sebo] added a panel to expose @media emulation (#1692434) and provided a way to emulate @media (prefers-reduced-motion: reduce) (#1477920) More … Read more

Firefox 155.0.1

Release Notes — 2026-09-04T00:00:00+00:00

Firefox 155.0.1 release notes.

Firefox for Android 155.0.1

Android Release Notes — 2026-09-04T00:00:00+00:00

Firefox for Android 155.0.1 release notes.

Thunderbird Desktop New Protocol Support: Microsoft Graph API

Thunderbird Blog — 2026-09-02T19:58:47+00:00

As many of you know, Microsoft will be disabling Exchange Web Services (EWS) support on its Microsoft 365 platform later this year. The Thunderbird Desktop team has been hard at work to ensure continuity of functionality through this transition, and today we are pleased to announce the release of native Thunderbird support for the Microsoft […] The post Thunderbird Desktop New Protocol Support: Microsoft Graph API appeared first on The Thunderbird Blog .

Firefox 155.0

Release Notes — 2026-09-01T00:00:00+00:00

Firefox 155.0 release notes.

Firefox for Android 155.0

Android Release Notes — 2026-09-01T00:00:00+00:00

Firefox for Android 155.0 release notes.

Icons! Lots of them! – These Weeks in Firefox: Issue 206

Firefox Nightly — 2026-08-25T17:43:36+00:00

Highlights Starting in Firefox 154, we’ve added a new capability for changing the default browser icon for Windows (Windows-only, for now, and not MSIX / Store installs) in about:settings#appearance! Notice … Read more

Firefox for Android 154.0.1

Android Release Notes — 2026-08-25T00:00:00+00:00

Firefox for Android 154.0.1 release notes.

Intent to Ship: JPEG XL

Mozilla Hacks — 2026-08-24T15:32:15+00:00

It isn’t often that new image formats land in browsers. In the early 2000s we had JPEG, GIF, and PNG. The 2010s gave us WebP, which was a modest step up from JPEG. But the 2020s have given us two new image formats that are a big step up from previous formats: AVIF and JPEG […] The post Intent to Ship: JPEG XL appeared first on Mozilla Hacks - the Web developer blog .

Firefox for Android 154.0

Android Release Notes — 2026-08-18T00:00:00+00:00

Firefox for Android 154.0 release notes.

Firefox for Android 153.0.4

Android Release Notes — 2026-08-11T00:00:00+00:00

Firefox for Android 153.0.4 release notes.

Desktop Calendar: A Design Journey

Thunderbird Blog — 2026-08-10T18:59:27+00:00

Hello, Thunderbird community and followers of the blog! This is Jesse from the design team. Today’s post is about our recent journey in redesigning the calendar portion of Thunderbird, and what you can expect us to deliver in the near future. The calendar is a key part of any productivity toolset, from your PC Desktop […] The post Desktop Calendar: A Design Journey appeared first on The Thunderbird Blog .

Firefox for Android 153.0.3

Android Release Notes — 2026-08-04T00:00:00+00:00

Firefox for Android 153.0.3 release notes.

Firefox for Android 153.0.2

Android Release Notes — 2026-07-31T14:18:19.495366+00:00

Firefox for Android 153.0.2 release notes.

Mobile Progress Report: July 2026

Thunderbird Blog — 2026-07-30T19:00:00+00:00

Thunderbird Mobile is moving forward with large steps on both platforms we support. On iOS, we’re working on the very foundation of a new app—our first built from scratch—and continuing to make progress in bringing the Thunderbird for iOS app to the App Store. For Android, it’s a matter of updating what we have in […] The post Mobile Progress Report: July 2026 appeared first on The Thunderbird Blog .

Firefox for Android 153.0.1

Android Release Notes — 2026-07-28T00:00:00+00:00

Firefox for Android 153.0.1 release notes.

Try the New Firefox Design in Nightly

Firefox Nightly — 2026-07-27T15:00:40+00:00

This past May, we shared our vision for the future of Firefox. Starting today, you can try out the next design evolution of Firefox in Nightly. It’s still Firefox, now … Read more

Thunderbird 153 “Meadow” is out now!

Thunderbird Blog — 2026-07-22T21:45:41+00:00

As we head into the summer months, a new Extended Support Release (ESR) is in full bloom. Thunderbird 153 “Meadow” is out now, and from all of us at MZLA, the Thunderbird Council, and our global community of contributors, we can’t wait for you to try it out. “Meadow” builds on Thunderbird 140 “Eclipse,” along […] The post Thunderbird 153 “Meadow” is out now! appeared first on The Thunderbird Blog .

Firefox for Android 153.0

Android Release Notes — 2026-07-21T00:00:00+00:00

Firefox for Android 153.0 release notes.

Community Office Hours: A Thundermail Update

Thunderbird Blog — 2026-07-14T19:36:40+00:00

Our Community Office Hours series is all about connecting with the people behind Thunderbird and our products, and sharing the work that’s happening behind the scenes. These conversations are a chance to learn more about the direction of our projects and to hear directly from the people making it happen. In this episode, we are […] The post Community Office Hours: A Thundermail Update appeared first on The Thunderbird Blog .

Firefox for Android 152.0.6

Android Release Notes — 2026-07-14T00:00:00+00:00

Firefox for Android 152.0.6 release notes.

Desktop settings research: what we learned from your feedback

Thunderbird Blog — 2026-07-07T18:56:45+00:00

A few weeks ago, we conducted hour-long conversations with 10 of our users to dig deep into how you manage your preferences and configurations in Thunderbird desktop. While this specific research cycle focused on the desktop experience, our ultimate goal is a holistic strategy that ensures our mobile settings feel like a natural extension of […] The post Desktop settings research: what we learned from your feedback appeared first on The Thunderbird Blog .

Thunderbird Monthly Development Digest: June 2026

Thunderbird Blog — 2026-06-25T18:34:34+00:00

Welcome back from the Thunderbird development team! The past few months have been exceptionally busy across the project. As we approach the midpoint of the year, we’ve been focused on a mixture of delivering user-facing features, investing in long-term architectural improvements, and preparing for the next ESR cycle. A significant amount of effort has gone […] The post Thunderbird Monthly Development Digest: June 2026 appeared first on The Thunderbird Blog .

Thundermail June 2026 update: what we learned after the first few waves of invites

Thunderbird Blog — 2026-06-23T17:24:23+00:00

Over the past several weeks, we have been welcoming early users from our waitlist into Thundermail, a few waves at a time. Many of you are now setting up your accounts, trying things out, and sharing your thoughts with us. Naming updates You may have noticed that we are now saying Thundermail more often, and […] The post Thundermail June 2026 update: what we learned after the first few waves of invites appeared first on The Thunderbird Blog .

PACT: Anonymous Credentials for the Web

Mozilla Hacks — 2026-06-23T15:29:52+00:00

This is the technical companion to our update on Distilled, “Keeping the web open and private in the bot era.” Here we take a deeper look at the problem space, the design we’re proposing, and the problems still left to solve. Bots (and privacy-preserving browsers) not welcome Browse a news site in a private window. Shop […] The post PACT: Anonymous Credentials for the Web appeared first on Mozilla Hacks - the Web developer blog .

Eyedropper Quick Action, geckodriver 0.37, and Tighter File Permissions – These Weeks in Firefox: Issue 205

Firefox Nightly — 2026-06-22T19:57:24+00:00

Highlights Dao added a new Eyedropper quick action! Check it out by typing “color” or “eyedropper” in the URL bar (Bug 1803575) on Nightly. Henrik Skupin released geckodriver 0.37.0, which … Read more

Mobile Progress Report: June 2026

Thunderbird Blog — 2026-06-16T11:00:00+00:00

The past month was busy; the theme was evolution. We went into this quarter with our own ideas for what we wanted to accomplish. However, our users had better ideas. With the release of Thunderbird’s own mail service, Thundermail, the need for a better account settings import process across our services and apps became vital. […] The post Mobile Progress Report: June 2026 appeared first on The Thunderbird Blog .

Giving You More Control – These Weeks in Firefox: Issue 204

Firefox Nightly — 2026-06-15T17:26:57+00:00

Highlights Maxx Crawford added a pref to hide the New Tab logo so users can opt out of branding without altering page layout or resorting to CSS overrides. Harshit enabled … Read more

More Kit, More Control – These Weeks in Firefox: Issue 203

Firefox Nightly — 2026-06-03T18:27:38+00:00

Highlights James enabled adaptive autofill in Nightly for testing, which we believe should provide better results in the URL bar when doing autocomplete! Jack updated the illustrations shown on some … Read more

Backup for a Rainy Day – These Weeks in Firefox: Issue 202

Firefox Nightly — 2026-06-01T18:15:45+00:00

Highlights The profile backup mechanism has been enabled by default for all desktop platforms in Nightly, as well as Beta! The current plan is to have this ride out to … Read more

Announcing Web Serial Support in Firefox

Mozilla Hacks — 2026-05-21T18:00:05+00:00

Support for Web Serial in Firefox 151 for Desktop Firefox can now connect directly to microcontrollers, development boards, 3D printers, power meters, and other serial-connected hardware from the web. Starting in Firefox 151 for Desktop, support for the Web Serial API allows web applications to communicate with compatible devices without requiring native software. Web Serial […] The post Announcing Web Serial Support in Firefox appeared first on Mozilla Hacks - the Web developer blog .

Saying goodbye to asm.js

SpiderMonkey — 2026-05-20T17:00:00+00:00

Disabling asm.js optimizations in SpiderMonkey

Settings Are Getting a New Look!

Firefox Nightly — 2026-05-20T15:53:01+00:00

The redesign of Firefox Settings is now enabled by default in Nightly! With this change, we are making it easier for people to customize Firefox and discover the controls that … Read more

Community Office Hours: Contributor Spotlight on Bogomil Shopov

Thunderbird Blog — 2026-05-08T19:15:13+00:00

If you have ever used Thunderbird in Bulgarian, the subject of this month’s office hours is one of the contributors who made that possible! Office Hours hosts Heather and Monica have been lucky enough to chat with long-time localizer Bogamil Shopov at conferences like FOSDEM. Now, they’re sitting down to talk to him about how […] The post Community Office Hours: Contributor Spotlight on Bogomil Shopov appeared first on The Thunderbird Blog .

Behind the Scenes Hardening Firefox with Claude Mythos Preview

Mozilla Hacks — 2026-05-07T16:01:21+00:00

Two weeks ago we announced that we had identified and fixed an unprecedented number of latent security bugs in Firefox with the help of Claude Mythos Preview and other AI models. In this post, we’ll go into more detail about how we approached this work, what we found, and advice for other projects on making […] The post Behind the Scenes Hardening Firefox with Claude Mythos Preview appeared first on Mozilla Hacks - the Web developer blog .

Trustworthy JavaScript for the Open Web

Mozilla Hacks — 2026-05-05T15:49:11+00:00

The open web is a critical platform for applications that handle highly sensitive data, from private communications to financial transactions and medical records. Traditionally, servers are trusted to deliver the appropriate code and resources for their web applications to browsers, who then provide a secure and isolated environment for their execution. In some circumstances, this […] The post Trustworthy JavaScript for the Open Web appeared first on Mozilla Hacks - the Web developer blog .

Import-ant Updates – These Weeks in Firefox: Issue 201

Firefox Nightly — 2026-04-30T16:29:24+00:00

Highlights Import attributes will be supported for WebExtensions, starting in Firefox 150! This allows WebExtension authors to import CSS module scripts and JSON into their JavaScript modules. Examples: import sheet … Read more

Thunderbird Pro April 2026 Update

Thunderbird Blog — 2026-04-27T15:27:08+00:00

One of the most exciting aspects of bringing Thunderbird Pro to life is the opportunity to build an email service from Thunderbird together with our community, giving users the control and freedom they expect without relying on third party email service providers. Over the past few months, we’ve been checking in with our community through […] The post Thunderbird Pro April 2026 Update appeared first on The Thunderbird Blog .

VPN, Split View, and Other Goodies – These Weeks in Firefox: Issue 200!

Firefox Nightly — 2026-04-27T14:21:43+00:00

Highlights The VPN feature is rolling out to users in the United States, the United Kingdom, Germany and France! Read more about it here. And here’s more information about it … Read more

Mobile Progress Report – April 2026

Thunderbird Blog — 2026-04-23T11:00:00+00:00

It’s been a very busy couple of months as we’ve reworked processes & priorities and established a roadmap for both iOS and Android. We are determining how best we can coordinate with the community, and think that our roadmap for the year has a good balance of fixes and features. Today, I want to talk […] The post Mobile Progress Report – April 2026 appeared first on The Thunderbird Blog .

QR Codes, Speed Calculators, Better RAM Usage – These Weeks in Firefox: Issue 199

Firefox Nightly — 2026-04-15T20:44:49+00:00

Highlights Thanks to overholt, macOS Nightly now has support for sharing the current tab’s URL via QR Code (Right-click tab, Share > Generate QR Code). This is held to Nightly … Read more

Benchmark Mode in SpiderMonkey

SpiderMonkey — 2026-04-13T17:00:00+00:00

Measuring performance without shooting youself in the foot (as badly)

Thunderbird Monthly Development Digest: March 2026

Thunderbird Blog — 2026-03-31T11:30:00+00:00

Welcome back from the Thunderbird development team! Reflecting back, the first quarter of the year has been a mix of deep technical focus and forward-looking planning. Much of the team’s energy has gone into tackling some of the more complex, “gnarly” parts of our projects to land key milestones. In parallel, we’ve been laying the […] The post Thunderbird Monthly Development Digest: March 2026 appeared first on The Thunderbird Blog .

Firefox Developer Edition and Beta: Try out Mozilla’s .rpm package!

Mozilla Hacks — 2026-03-25T16:17:11+00:00

In January, we introduced our Nightly package for RPM-based Linux distributions. Today, we are thrilled to announce it is now available for Firefox Beta! Firefox Beta is great for testing your sites in a version of Firefox that will reach regular users in the coming weeks. If you find any issues, please file them on […] The post Firefox Developer Edition and Beta: Try out Mozilla’s .rpm package! appeared first on Mozilla Hacks - the Web developer blog .

Extension Theming Improvements and More – These Weeks in Firefox: Issue 198

Firefox Nightly — 2026-03-20T17:34:25+00:00

Highlights Starting with Firefox 150, Firefox Desktop’s theming internals have improved, allowing custom background images provided by built-in and custom themes to extend over the sidebar UI background – Bug … Read more

Introducing our Public Roadmaps

Thunderbird Blog — 2026-03-19T19:26:26+00:00

At Thunderbird, we firmly believe in the strength of listening to our community’s needs and wants, and balancing it with our resources and capabilities. While this has always been part of our ethos, we want to start 2026 by making our goals easier to read and comprehend at roadmaps.thunderbird.net, where you will find our roadmaps […] The post Introducing our Public Roadmaps appeared first on The Thunderbird Blog .

VIDEO: Meet the New Support Team!

Thunderbird Blog — 2026-03-17T22:05:54+00:00

Welcome to the first Community Office Hours of 2026! We’re all recovered from conferences in Brussels and California, and we’re talking to members of one of our newest teams: Support. Wait, hasn’t Thunderbird always had a support team? Surprisingly, no! We’ve had individual staff members responsible for different parts of our support efforts, but never […] The post VIDEO: Meet the New Support Team! appeared first on The Thunderbird Blog .

Firefox Profiler Dark Mode and Updated Smart Window Prompts – These Weeks in Firefox: Issue 197

Firefox Nightly — 2026-03-17T19:57:12+00:00

Highlights Smart Window added contextual prompts for follow-ups bug 2012208 and conversation starters bug 2014946 SplitView is approaching completion in Nightly and hopes to ride the trains soon. If you … Read more

Why is WebAssembly a second-class language on the web?

Mozilla Hacks — 2026-02-26T16:02:36+00:00

This post is an expanded version of a presentation I gave at the 2025 WebAssembly CG meeting in Munich. WebAssembly has come a long way since its first release in 2017. The first version of WebAssembly was already a great fit for low-level languages like C and C++, and immediately enabled many new kinds of […] The post Why is WebAssembly a second-class language on the web? appeared first on Mozilla Hacks - the Web developer blog .

Goodbye innerHTML, Hello setHTML: Stronger XSS Protection in Firefox 148

Mozilla Hacks — 2026-02-24T13:00:02+00:00

Cross-site scripting (XSS) remains one of the most prevalent vulnerabilities on the web. The new standardized Sanitizer API provides a straightforward way for web developers to sanitize untrusted HTML before inserting it into the DOM. Firefox 148 is the first browser to ship this standardized security enhancing API, advancing a safer web for everyone. We […] The post Goodbye innerHTML, Hello setHTML: Stronger XSS Protection in Firefox 148 appeared first on Mozilla Hacks - the Web developer blog

Launching Interop 2026

Mozilla Hacks — 2026-02-12T17:07:24+00:00

The Interop Project is a cross-browser initiative to improve web compatibility in areas that offer the most benefit to both users and developers. The group, including Apple, Google, Igalia, Microsoft, and Mozilla, takes proposals of features that are well defined in a sufficiently stable web standard, and have good test suite coverage. Then, we come […] The post Launching Interop 2026 appeared first on Mozilla Hacks - the Web developer blog .

Firefox extensions for creatives

Add-ons Blog — 2026-01-23T01:08:17+00:00

From designers to writers, multi-media producers and more — if you perform creative work on a computer there’s a good chance you can find a browser extension to improve your process. Here’s a mix of practical Firefox extensions for a wide spectrum of creative cases… Extensions for visual artists, animators & designers Awesome Screenshot & Screen Recorder There are a lot of screenshot and recording tools out there, but few offer the sweet combination of intuitive control and a deep feature set li

YouTube your way — browser extensions put you in charge of your video experience

Add-ons Blog — 2026-01-22T23:57:17+00:00

YouTube wants you to experience YouTube in prescribed ways. But with the right browser extension, you’re free to alter YouTube to taste. Change the way the site looks, behaves, and delivers your favorite videos. Enhancer for YouTube With dozens of customization features, Enhancer for YouTube has the power to dramatically reorient the way you watch videos. While a bunch of customization options may seem overwhelming, Enhancer for YouTube actually makes it very simple to navigate settings and sele

Flipping Responsibility for Jobs in SpiderMonkey

SpiderMonkey — 2026-01-15T17:00:00+00:00

Changes are coming to job handling in SpiderMonkey

2025 Staff Pick Add-ons

Add-ons Blog — 2026-01-08T14:59:52+00:00

While nearly half of all Firefox users have installed an add-on, it’s safe to say nearly all Firefox staffers use add-ons. I polled a few of my peers and here are some of our staff favorite add-ons of 2025… Falling Snow Animated Theme Enjoy the soothing mood of Falling Snow Animated Theme . This motion-animated dark theme turns Firefox into a calm wintry night as snowflakes cascade around the corners of your browser. Privacy Badger The flagship anti-tracking extension from privacy proponents at

Supercharge your productivity with a Firefox extension

Add-ons Blog — 2025-11-04T01:42:25+00:00

With more work and education happening online you may find yourself needing new ways to juice your productivity. From time management to organizational tools and more, the right Firefox extension can give you an edge in the art of efficiency. I need help saving and organizing a lot of web content Raindrop.io Organize anything you find on the web with Raindrop.io — news articles, videos, PDFs, and more. Raindrop.io makes it simple to gather clipped web content by subject matter and organize with

Who needs Graphviz when you can build it yourself?

SpiderMonkey — 2025-10-28T17:00:00+00:00

Exploring a new layout algorithm for control flow graphs.

Reddit revolutionized — use a browser extension to enhance your favorite forum

Add-ons Blog — 2025-10-16T21:29:46+00:00

Reddit is awash with great conversation (well, not all the time) . There’s a Reddit forum for just about everybody — sports fans , gamers , poets inspired by food , people who like arms on birds — you get the idea. If you spend time on Reddit, there are ways to augment your experience with a browser extension… Reddit Enhancement Suite Used by millions of Redditors across various browsers, Reddit Enhancement Suite is optimized to work with the beloved “old Reddit”. Key features: Subreddit manager

Boost your writing skills with a browser extension

Add-ons Blog — 2025-10-16T19:54:02+00:00

Whatever kind of writing you do — technical documentation, corporate communications, Harry Potter-vampire crossover fan fiction — it probably happens online. Here are some fabulous browser extensions that will benefit anyone who writes on the web. Get grammar help, productivity tools, and other strong writing aids… LanguageTool It’s like having your own copy editor with you wherever you write on the web. Language Tool – Grammar and Spell Checker will make you a better writer in 25+ languages. Mo

Extension starter pack

Add-ons Blog — 2025-10-16T19:22:03+00:00

You’ve probably heard about “ad blockers,” “tab managers,” “anti-trackers” or any number of browser customization tools commonly known as extensions. And maybe you’re intrigued to try one, but you’ve never installed an extension before and the whole notion just seems a bit vague. Let’s demystify extensions. An extension is simply an app that runs on a browser like Firefox. From serious productivity and privacy enhancing features to fun stuff like changing the way the web looks and feels, extensi

Translate the web easily with a browser extension

Add-ons Blog — 2025-10-15T23:14:16+00:00

At Mozilla, of course we’re fans of Firefox’s built-in, privacy-focused translation feature , but the beauty of browser extensions is the vast array of niche tools and customization features they can provide. Sometimes finding the right extension for your personal needs can profoundly change the way you interact with the web. So if you do a lot of translating on the internet, you might consider using a specialized extension translator. Here are some great options… I just want a simple, efficient

CRLite: Fast, private, and comprehensive certificate revocation checking in Firefox

Mozilla Hacks — 2025-08-19T16:03:19+00:00

Firefox is now the first and the only browser to deploy fast and comprehensive certificate revocation checking that does not reveal your browsing activity to anyone (not even to Mozilla). Tens of millions of TLS server certificates are issued each day to secure communications between browsers and websites. These certificates are the cornerstones of ubiquitous […] The post CRLite: Fast, private, and comprehensive certificate revocation checking in Firefox appeared first on Mozilla Hacks - the Web

Top anti-tracking extensions

Add-ons Blog — 2025-07-26T01:05:07+00:00

The truth of modern tracking is that it happens in so many different and complex ways it’s practically impossible to ensure absolute tracking protection. But that doesn’t mean we’re powerless against personal data harvesters attempting to trace our every online move. There are a bunch of Firefox browser extensions that can give you tremendous anti-tracking advantages… Privacy Badger Sophisticated and effective anti-tracker that doesn’t require any setup whatsoever. Simply install Privacy Badger

Tweak Twitch—BetterTTV and other extensions for Twitch customization

Add-ons Blog — 2025-07-26T00:33:08+00:00

Customize chat, optimize your video player, auto-collect channel points, and much much more. Explore some of the ways you can radically transform your Twitch experience with a browser extension… BetterTTV One of the most feature rich and popular Twitch extensions out there, BetterTTV has everything from fun new emoticons to advanced content filtering. Key features: Auto-collect channel points Easier-to-read chat interface Select usernames, words, or specific phrases you want highlighted througho

5 Things You Might Not Know about Developing Self-Hosted Code

SpiderMonkey — 2025-04-23T00:00:00+00:00

Self-hosted code is JavaScript code that SpiderMonkey uses to implement some of its intrinsic functions for JavaScript. Because it is written in JavaScript, it gets all the benefits of our JITs, like inlining and inline caches.

Shipping Temporal

SpiderMonkey — 2025-04-11T18:00:00+00:00

The Temporal proposal provides a replacement for Date, a long standing pain-point in the JavaScript language. This blog post describes some of the history and motivation behind the proposal. The Temporal API itself is well docmented on MDN.

Improving Firefox Stability in the Enterprise by Reducing DLL Injection

Mozilla Hacks — 2025-03-25T18:31:16+00:00

Beginning in version 138, Firefox will offer an alternative to DLL injection for Data Loss Prevention (DLP) deployments in enterprise environments. DLL Injection DLL injection into Firefox is a topic we’ve covered on the Hacks blog before. In 2023, we blogged about the Firefox capability to let users block third-party DLLs from being loaded. We […] The post Improving Firefox Stability in the Enterprise by Reducing DLL Injection appeared first on Mozilla Hacks - the Web developer blog .

SpiderMonkey Newsletter (Firefox 135-137)

SpiderMonkey — 2025-03-17T20:00:00+00:00

Hello everyone,

Implementing Iterator.range in SpiderMonkey

SpiderMonkey — 2025-03-05T07:00:00+00:00

In October 2024, I joined Outreachy as an Open Source contributor and in December 2024, I joined Outreachy as an intern working with Mozilla. My role was to implement the TC39 Range Proposal in the SpiderMonkey JavaScript engine. Iterator.range is a new built-in method proposed for JavaScript iterators that allows generating a sequence of numbers within a specified range. It functions similarly to Python’s range, providing an easy and efficient way to iterate over a series of values:

Making Teleporting Smarter

SpiderMonkey — 2025-02-19T18:00:00+00:00

Recently I got to land a patch which touches a cool optimization, that I had to really make sure I understood deeply. As a result, I wrote a huge commit message. I’d like to expand that message a touch here and turn it into a nice blog post.

Launching Interop 2025

Mozilla Hacks — 2025-02-13T16:59:13+00:00

Interop 2025 continues the mission to make the web more consistent across browsers, building on 2024’s 95% interoperability score. This year, 19 focus areas target key developer needs and long-standing issues, including WebRTC improvements, Storage Access API, and CSS Zoom. The post Launching Interop 2025 appeared first on Mozilla Hacks - the Web developer blog .

Is Memory64 actually worth using?

SpiderMonkey — 2025-01-15T18:00:00+00:00

After many long years, the Memory64 proposal for WebAssembly has finally been released in both Firefox 134 and Chrome 133. In short, this proposal adds 64-bit pointers to WebAssembly.

Introducing Uniffi for React Native: Rust-Powered Turbo Modules

Mozilla Hacks — 2024-12-04T19:38:01+00:00

Mozilla and Filament have introduced Uniffi for React Native, a tool that allows developers to leverage the safety and performance benefits of Rust in cross-platform React Native apps. The post Introducing Uniffi for React Native: Rust-Powered Turbo Modules appeared first on Mozilla Hacks - the Web developer blog .

How to turn your household pet into a Firefox theme

Add-ons Blog — 2024-10-17T22:54:58+00:00

Themes are a fun way to change the visual appearance of Firefox and give the browser a look that’s all your own. You’re free to explore more than a half-million community created themes on addons.mozilla.org (AMO), or better yet, create your own custom theme. Best of all — create a theme featuring a beloved pet! Then you can take your little buddy with you wherever you go on the web. (You’ll need a Mozilla account to create and publish Firefox themes on AMO.) Prepare your pet pic for upload I fi

Llamafile v0.8.14: a new UI, performance gains, and more

Mozilla Hacks — 2024-10-16T13:32:30+00:00

Discover the latest release of Llamafile 0.8.14, an open-source AI tool by Mozilla Builders. With a new command-line chat interface, enhanced performance, and support for powerful models, Llamafile makes it easy to run large language models (LLMs) on your own hardware. Learn more about the updates and how to get involved with this cutting-edge project. The post Llamafile v0.8.14: a new UI, performance gains, and more appeared first on Mozilla Hacks - the Web developer blog .

0Din: A GenAI Bug Bounty Program – Securing Tomorrow’s AI Together

Mozilla Hacks — 2024-08-08T18:39:13+00:00

As AI continues to evolve, so do the threats against it. As these GenAI systems become more sophisticated and widely adopted, ensuring their security and ethical use becomes paramount. 0Din is a groundbreaking GenAI bug bounty program dedicated specifically to help secure GenAI systems and beyond. In this blog, you'll learn about 0Din, how it works, and how you can participate and make a difference in securing our AI future. The post 0Din: A GenAI Bug Bounty Program – Securing Tomorrow’s AI Toge

Announcing Official Puppeteer Support for Firefox

Mozilla Hacks — 2024-08-07T15:44:40+00:00

We’re pleased to announce that, as of version 23, the Puppeteer browser automation library now has first-class support for Firefox. This means that it’s now easy to write automation and perform end-to-end testing using Puppeteer, and run against both Chrome and Firefox. The post Announcing Official Puppeteer Support for Firefox appeared first on Mozilla Hacks - the Web developer blog .

Snapshots for IPC Fuzzing

Mozilla Hacks — 2024-06-27T16:18:49+00:00

Process separation remains one of the most important parts of the Firefox security model and securing our IPC (Inter-Process Communication) interfaces is crucial to keep privileges in the different processes separated. We take a more detailed look at our newest tool for finding vulnerabilities in these interfaces – snapshot fuzzing. The post Snapshots for IPC Fuzzing appeared first on Mozilla Hacks - the Web developer blog .

Sponsoring sqlite-vec to enable more powerful Local AI applications

Mozilla Hacks — 2024-06-25T15:25:58+00:00

Today we’re proud to announce the next Mozilla Builders project: sqlite-vec. Led by independent developer Alex Garcia, this project brings vector search functionality to the beloved SQLite embedded database. Alex has been working on this problem for a while, and we think his latest approach will have a great impact by providing application developers with a powerful new tool for building Local AI applications. The post Sponsoring sqlite-vec to enable more powerful Local AI applications appeared

What’s the best ad blocker for you?

Add-ons Blog — 2024-06-04T00:30:18+00:00

So you’ve decided to do something about all those annoying ads you’re barraged with online. What pushed you over the edge? Auto-play video ads? Blaring banners? Tired of your music interrupted by a sudden sponsorship? Was it the realization they intentionally make the ‘Close’ buttons [x] on ads super tiny so you accidentally click the very thing you’re trying to avoid? There are a number of approaches you can take to blocking ads with a browser extension—it just depends on what you’re trying to

Experimenting with local alt text generation in Firefox Nightly

Mozilla Hacks — 2024-05-31T16:43:46+00:00

Firefox 130 will introduce an experimental new capability to automatically generate alt-text for images using a fully private on-device AI model. The feature will be available as part of Firefox’s built-in PDF editor, and our end goal is to make it available in general browsing for users with screen readers. The post Experimenting with local alt text generation in Firefox Nightly appeared first on Mozilla Hacks - the Web developer blog .

Extensions for cleaning up a chaotic desktop

Add-ons Blog — 2023-03-28T02:54:01+00:00

Clutter isn’t just material stuff scattered about your floor and shelves. Clutter can consume us in digital form, too — from an overabundance of browser bookmarks and open tabs to navigating a world wide web that’s littered with junk. The right browser extension, however, can really help clean things up… Tranquility Reader Want to sweep away all the mess around your website reading material, like images, ads, and links to other content you don’t care about? Tranquility Reader does just that. Hit

Roblox browser extensions for better gaming

Add-ons Blog — 2023-01-10T00:43:05+00:00

Every day, more than 50 million people play among millions of user-created games on Roblox . With a massive global audience and an ocean of games, there are vastly different ways users like to interact with Roblox. This is where the customization power of browser extensions can shine. If you’re a Roblox player or creator, you might be intrigued to explore some of these innovative extensions built just for Roblox users on Firefox. BTRoblox Packed with features, BTRoblox can do everything from alt

How Firefox’s Total Cookie Protection and container extensions work together

Add-ons Blog — 2022-08-23T09:28:17+00:00

When we recently announced the full public roll-out of Firefox Total Cookie Protection — a new default browser feature that automatically confines cookies to the websites that created them, thus eliminating the most common method that sites use to track you around the web — it raised a question: Do container extensions like Mozilla’s Facebook Container and Multi-Account Containers still serve a purpose, since they similarly perform anti-tracking functions by suppressing cookie trails? In short,

The pandemic changed everything — even the way we use browser extensions

Add-ons Blog — 2022-03-09T17:30:28+00:00

On March 11, 2020 the World Health Organization declared COVID-19 a global pandemic. Within days, practically the entire planet was on lockdown. We went indoors and online. So how did the sudden mass migration online impact browser extension usage? Pretty dramatically, it turns out. On this two-year mark of the start of the pandemic we looked back at Firefox extension installs and usage data to discover several compelling trends. We wanted to see the types of extensions Firefox users were drawn

Find that font! I must have that font!

Add-ons Blog — 2022-01-08T00:10:29+00:00

You’re probably a digital designer or work in some publishing capacity (otherwise it would be pretty strange to have a fascination with fonts); and you appreciate the aesthetic power of exceptional typography. So what do you do when you encounter a wonderful font in the wild that you might want to use in your own design work? Well, if you have a font finder browser extension you can learn all about it within a couple mouse clicks. Here are some of our favorite font discovery extensions… Font Fin

Level up your Steam experience with a browser extension

Add-ons Blog — 2021-12-20T23:08:36+00:00

With more than 120 million users worldwide and 50,000+ games in its ecosystem, Steam is an extraordinarily eclectic gaming distribution platform. Given its broad reach, it makes sense that different users have different ways they’d like to adjust and optimize their personal Steam experience. That’s where browser extensions come in… Augmented Steam Packed with features that do everything from finding game deals to organizing content, Augmented Steam has a little something for every kind of Steam

Firefox’s most popular and innovative browser extensions of 2021

Add-ons Blog — 2021-12-14T14:10:39+00:00

About one-third of Firefox users have installed an add-on—be it an extension to equip Firefox with a custom feature or a visual theme to personalize their browsing experience. What kind of extensions did we use most in 2021? And what are some of the new, innovative extensions to emerge this year? Let’s find out! Two ad blockers vie for most popular in 2021 Note we’re using ‘average daily users’ (ADU) across the span of 2021 as the metric to determine “most popular.” We feel ADU offers the most a

The magic of mouse gestures

Add-ons Blog — 2021-11-18T19:36:52+00:00

Mouse gestures are mouse movement and key combinations that give you the power to customize the way you maneuver around web pages. If your online work requires a fair amount of distinct, repetitive activity—things like rapid page scrolling, opening links in background tabs, closing batches of open tabs, etc.—the right mouse gesture can make a major impact on your task efficiency. Here are a few browser extensions that provide excellent mouse gesture features… Gesturefy With 80+ predefined mouse