Support/Firefox140
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Firefox 140 release information
Disclaimer
The following information is intended for members of the Mozilla Support community for the purpose of supporting users in the Mozilla Support platform. Mozilla Support is a community of enthusiastic volunteers and employees trying to support Mozilla's users around the globe. You can join us by contributing through the following ways:
- Answer questions in the support forum
- Write help articles
- Localize support content
- Provide support on social media channels
- Respond to mobile store reviews
To learn more about how to stay updated with Firefox release information, trending, and known issues, please also check out How to stay updated with Firefox release
Release notes
- Desktop 140.0 Release Notes
- ESR 115.25.0 Release Notes
- ESR 128.12.0 Release Notes
- ESR 140.0 Release Notes
- Firefox for Enterprise 140 Release Notes
- Firefox for developers 140 Release Notes
- Firefox for Android 140.0 Release Notes
- Firefox for iOS 140.0 Release Notes
Dot releases
| Platform | Version | Release date | Notable fixes | Unresolved |
|---|---|---|---|---|
| Firefox Desktop | 140.0.1 | Juni 26, 2025 | bug1971487, bug1973947 | bug1968040 |
| Firefox & Focus for iOS | 140.1 | June 26, 2025 | Various stability fixes | - |
Bug & feedback boards
Contributor discussions
Please refer to the following contributor forum threads to learn more about known issues and discuss with other contributors:
You can also join our Matrix channel to ask questions/join community discussion.
Stay updated
Apart from sharing release information, there are other ways to stay updated with product release and community updates:
- Community call: We run a monthly community call (usually on the same week we release a new Firefox version). Check our schedule here and don't hesitate to join the call in person if you can!
- Newsletter: Consider subscribing to Firefox Daily Digest to get daily updates (Mon-Fri) about Firefox from across the internet.
What's new in Firefox 140
Content in this page is being updated periodically as we're rolling out the release.
Firefox Desktop content update
| Adding Custom Search Engines | ||
|---|---|---|
| Description: | New way to add custom search engines to Firefox desktop | |
| Content request: | [2] | |
| KB article: | https://support.mozilla.org/kb/add-custom-search-engine-firefox | New article |
| How to unload tab | ||
|---|---|---|
| Description: | New feature in v140 to unload tab(s) to reduce Firefox's memory usage | |
| Content request: | [3] | |
| KB article: | https://support.mozilla.org/kb/unload-tabs-reduce-memory-usage-firefox/ | New article |
| Update to address autofill article - Australia and India rollout | ||
|---|---|---|
| Description: | As title | |
| Content request: | [4] | |
| KB article: | https://support.mozilla.org/kb/automatically-fill-your-address-web-forms | Article update |
| Address autofill article - Italy, Poland and Austria rollout | ||
|---|---|---|
| Description: | As title | |
| Content request: | [5] | |
| KB article: | https://support.mozilla.org/kb/automatically-fill-your-address-web-forms | Article update |
| Chrome Import Changes on Windows -- Passwords via CSV, Payment methods disabled | ||
|---|---|---|
| Description: | Feature description | |
| Content request: | [6] | |
| KB articles: | https://support.mozilla.org/kb/import-bookmarks-google-chrome | Article update |
| https://support.mozilla.org/kb/import-data-another-browser | Article update | |
| On-device Model Management | ||
|---|---|---|
| Description: | We'd like to empowers users to control AI on their devices with a transparent, user-first local model management system through this feature | |
| Content request: | [7] | |
| KB article: | https://support.mozilla.org/kb/on-device-models | New article |
Firefox for Android content update
| Firefox Android Biometric Authentication in Private Browsing Mode | ||
|---|---|---|
| Description: | introducing biometric authentication—face, fingerprint, or PIN unlock—for private browsing mode (PBM) | |
| Content request: | [8] | |
| KB article: | https://support.mozilla.org/kb/screen-lock-private-browsing-firefox-android | New article |
| Bookmark management "Select all" functionality | ||
|---|---|---|
| Description: | Added the ability to "select all" in the bookmarks screen | |
| Content request: | [9] | |
| KB articles: | https://support.mozilla.org/kb/manage-bookmark-folders-firefox-android | Article update |
| https://support.mozilla.org/en-US/kb/add-delete-and-view-bookmarked-webpages-firefox-android | Article update | |
Firefox for iOS content update
| Address bar location on iOS | ||
|---|---|---|
| Description: | We updated the setting that used to be called "Toolbar". Now the setting is called "Address Bar". | |
| Content request: | [10] | |
| KB article: | https://support.mozilla.org/kb/how-move-search-bar-firefox-ios | Article update |
Known studies/experiments
| Platform | Studies/experiments | Description | Related discussions | Forum tag |
|---|---|---|---|---|
| Firefox for Android | Android tablet address bar moved on top of the screen | - | [11] | browser-appearance |
| Firefox for Android | Search box in the middle of home screen | - | browser-appearance | |
| Firefox for Android | Remove all content (including Jump Back In, Bookmarks, Recently Visited) from home screen except Shortcuts and Stories | - | - | browser-appearance |
Trending requests
| Platform | Request | Related discussions | Status |
|---|---|---|---|
| Desktop | Synced tab groups | [12] | Tracking |
| Desktop | Customizable bookmark toolbar font | [13] | Tracking |
| Desktop | Customizable hotkeys | [14] | Tracking |
| Desktop | Differentiate "Site you save" and "Sites you visit" in new tab | [15] [16] | Tracking |
| Android | Android address bar is too cluttered | [17] [18] | Tracking |
| Android | Add a setting to enable tab strip | ConnectBugzilla | Tracking |
| iOS | Default page zoom setting | [19] | In progress |
| iOS | Translate feature in Firefox for iOS | [20] | Tracking |
For other top requests on Mozilla Connect, please check out [21]
Known issues
| Platform | Category | Issue | Known bug/Related discussions | Fix/workaround |
|---|---|---|---|---|
| Desktop | Webcompat | NYT tells me I am a bot and will not let me read articles | #162420 | Create a new profile? (to be confirmed) |
| Desktop | Webcompat | Facebook audio and video call isn't working in Firefox | bug1896361 | - |
| Desktop | UI/UX | In vertical mode, when the tab strip is not in a <toolbar>, SVG favicons using prefers-color-scheme don't always get the correct color-scheme according to theme colors. | bug1968040 | A fix is coming in v141 |
| Desktop | Media | Taskbar Appearing when playing Full Screen Videos | bug1965699 | A fix is coming in v141 |
| Desktop | UI/UX | Switching search engines on a new address bar | [22] [23] | Use keyword shortcut (e.g. @google, @ddg) on the new address bar |
| Android | UI/UX | Back button jumps to first entry in tab's history rather than previous entry | bug1958609 | Fixed in v139 |
| Android | UI/UX | Don't show the empty state while bookmarks are loading | bug1957713 | Fixed in v140 |
| Android | Security | Unexpected client auth certificate request dialogs | bug1966033 | Fixed in v140 |
| Android | UI/UX | spacebar and backspace working abnormaly in google search bar with gboard | bug1968872 | - |
| iOS | OS/API | User is redirected to Google app after force-closing and reopening Firefox if a Google search is open | https://github.com/mozilla-mobile/firefox-ios/issues/26361 | Remediation added in v139.1 and v140.0b1 (waiting for feedback) |
Known incidents
| Sidebar dark theme issue | |
|---|---|
| Description: | Sidebar text has changed from white to black for some themes resulting in low contrast with dark background |
| Status: | Resolved |
| Product(s) impacted: | Firefox Desktop |
| Associated bug: | [24] |
| Resolution/workaround: | Fixed in 140.0.1 |
| Startup crashes in Fx140 caused by DLL | |
|---|---|
| Description: | Crash in [@ ff64.dll SetThreadInformation] |
| Status: | Resolved |
| Product(s) impacted: | Firefox Desktop |
| Associated bug: | https://bugzilla.mozilla.org/show_bug.cgi?id=1973947 |
| Resolution/workaround: | Fixed in 140.0.1 |