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= Firefox 140 release information =
= Firefox 140 release information =


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== Release notes ==
== Release notes ==
* [https://www.mozilla.org/firefox/140.0/releasenotes/ Desktop 140.0 Release Notes]
* [https://www.mozilla.org/firefox/140.0/releasenotes/ Desktop 140.0 Release Notes] - [https://www.reddit.com/r/firefox/comments/1ljavvk/firefox_1400_see_all_new_features_updates_and/ r/firefox thread]
* [https://www.mozilla.org/firefox/115.25.0/releasenotes/ ESR 115.25.0 Release Notes]
* [https://www.mozilla.org/firefox/128.12.0/releasenotes/ ESR 128.12.0 Release Notes]
* [https://www.mozilla.org/firefox/128.12.0/releasenotes/ ESR 128.12.0 Release Notes]
* [https://www.mozilla.org/firefox/115.25.0/releasenotes/ ESR 115.25.0 Release Notes]
* [https://www.mozilla.org/firefox/140.0/releasenotes/ ESR 140.0 Release Notes]
* [https://support.mozilla.org/kb/firefox-enterprise-140-release-notes Firefox for Enterprise 140 Release Notes]
* [https://support.mozilla.org/kb/firefox-enterprise-140-release-notes Firefox for Enterprise 140 Release Notes]
* [https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/140 Firefox for developers 140 Release Notes]
* [https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/140 Firefox for developers 140 Release Notes]
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== Dot releases ==
== Dot releases ==
TBD
<!--
{| class="wikitable"
{| class="wikitable"
|-
|-
! Platform !! Version !! Release date !! Notable fixes !! Unresolved
! Platform !! Version !! Release date !! Notable fixes !! Unresolved
|-
|-
| Firefox Desktop || [https://www.mozilla.org/firefox/137.0.1/releasenotes/ 137.0.1] || April 13, 2025 || [https://bugzilla.mozilla.org/ bugxxxxx], [https://bugzilla.mozilla.org/ bugxxxxx], [https://bugzilla.mozilla.org/ bugxxxxx] || -
| Firefox Desktop || [https://www.mozilla.org/firefox/140.0.1/releasenotes/ 140.0.1] || June 26, 2025 || [https://bugzilla.mozilla.org/1971487 bug1971487], [https://bugzilla.mozilla.org/1973947 bug1973947] || [https://bugzilla.mozilla.org/show_bug.cgi?id=1968040 bug1968040]
|-
|-
| Firefox & Focus for Android || [https://www.mozilla.org/firefox/android/130.0.1/releasenotes/ 137.0.1] || April 13, 2025 || Various stability fixes || -
| Firefox & Focus for iOS || 140.1 || June 26, 2025 || Various stability fixes || -
|-
|-
| Firefox & Focus for iOS || 137.1 || April 13, 2025 || Various stability fixes || -
| Firefox Desktop || [https://www.mozilla.org/firefox/140.0.2/releasenotes/ 140.0.2] || June 28, 2025 || [https://bugzilla.mozilla.org/1974259 bug1974259] ||
|-
| Firefox & Focus for Android || [https://www.mozilla.org/firefox/android/140.0.3/releasenotes/ 140.0.3] || July 1, 2025 || [https://bugzilla.mozilla.org/show_bug.cgi?id=1956165 bug1956165], [https://bugzilla.mozilla.org/show_bug.cgi?id=1974569 bug1974569] || -
|-
| Firefox Desktop || [https://www.mozilla.org/firefox/140.0.4/releasenotes/ 140.0.4] || July 8, 2025 || [https://bugzilla.mozilla.org/1971053 bug1971053], [https://bugzilla.mozilla.org/show_bug.cgi?id=1971094 bug1971094] ||
|-
| Firefox & Focus for Android || [https://www.mozilla.org/firefox/android/140.0.4/releasenotes/ 140.0.4] || July 8, 2025 || Various stability fixes || -
|}
|}
-->


== Bug & feedback boards ==
== Bug & feedback boards ==
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== Contributor discussions ==
== Contributor discussions ==
Please refer to the following contributor forum threads to learn more about known issues and discuss with other contributors:
Please refer to the following contributor forum threads to learn more about known issues and discuss with other contributors:
* [https://support.mozilla.org/forums/contributors/ Desktop release discussion]
* [https://support.mozilla.org/forums/contributors/717338 Desktop release discussion]
* [https://support.mozilla.org/forums/contributors/ Mobile release discussion]
* [https://support.mozilla.org/forums/contributors/717341 Mobile release discussion]
* [https://support.mozilla.org/forums/l10n-forum Localization discussion]
* [https://support.mozilla.org/forums/l10n-forum Localization discussion]


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|colspan="2"|[https://bugzilla.mozilla.org/show_bug.cgi?id=1968772]
|colspan="2"|[https://bugzilla.mozilla.org/show_bug.cgi?id=1968772]
|-
|-
|rowspan="5"|'''KB articles:'''
|rowspan="43"|'''KB articles:'''
|https://support.mozilla.org/kb/extensions-button
|https://support.mozilla.org/kb/extensions-button
|rowspan="43"|Articles update
|rowspan="43"|Articles update
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{| class="wikitable"
{| class="wikitable"
!colspan="3"|bug1961945
!colspan="3"|On-device Model Management
|-
|-
|'''Description:'''
|'''Description:'''
|colspan="2"|TBD
|colspan="2"|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:'''
|'''Content request:'''
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=== Firefox for Android content update ===
=== Firefox for Android content update ===
{| class="wikitable"
!colspan="3"|Firefox Android Biometric Authentication in Private Browsing Mode
|-
|'''Description:'''
|colspan="2"|introducing biometric authentication—face, fingerprint, or PIN unlock—for private browsing mode (PBM)
|-
|'''Content request:'''
|colspan="2"|[https://bugzilla.mozilla.org/show_bug.cgi?id=1955669]
|-
|'''KB article:'''
|https://support.mozilla.org/kb/screen-lock-private-browsing-firefox-android
|New article
|}
{| class="wikitable"
!colspan="3"|Bookmark management "Select all" functionality
|-
|'''Description:'''
|colspan="2"|Added the ability to "select all" in the bookmarks screen
|-
|'''Content request:'''
|colspan="2"|[https://bugzilla.mozilla.org/show_bug.cgi?id=1972671]
|-
|rowspan="2"|'''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
|}


<!--
<!--
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=== Firefox for iOS content update ===
=== Firefox for iOS content update ===
{| class="wikitable"
!colspan="3"| Address bar location on iOS
|-
|'''Description:'''
|colspan="2"|We updated the setting that used to be called "Toolbar". Now the setting is called "Address Bar".
|-
|'''Content request:'''
|colspan="2"|[https://bugzilla.mozilla.org/show_bug.cgi?id=1972917]
|-
|'''KB article:'''
|https://support.mozilla.org/kb/how-move-search-bar-firefox-ios
|Article update
|}
<!--
<!--
{| class="wikitable"
{| class="wikitable"
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== Known studies/experiments ==
== Known studies/experiments ==
<!--
{| class="wikitable"
{| class="wikitable"
|-
|-
! Platform !! Studies/experiments !! Description !! Related discussions !! Forum tag
! Platform !! Studies/experiments !! Description !! Related discussions !! Forum tag
|-
|-
| Firefox desktop || - || - || - || -
| Firefox for Android || Android tablet address bar moved on top of the screen || - || [https://connect.mozilla.org/t5/discussions/android-tablet-address-bar-location/m-p/98141#M38217] || [https://support.mozilla.org/questions/mobile?tagged=browser-appearance browser-appearance]
|-
| Firefox for Android || Search box in the middle of home screen || [[File:Screen Shot 2025-05-28 at 8.35.07 AM.png|thumb]] || - || [https://support.mozilla.org/questions/mobile?tagged=browser-appearance browser-appearance]
|-
| Firefox for Android || Remove all content (including Jump Back In, Bookmarks, Recently Visited) from home screen except Shortcuts and Stories || - || - || [https://support.mozilla.org/questions/mobile?tagged=browser-appearance browser-appearance]
|}
|}
-->


== Top requests ==
== Trending requests ==
<!--
{| class="wikitable"
{| class="wikitable"
|-
|-
! Platform !! Request !! Related discussions !! Status
! Platform !! Request !! Related discussions !! Status
|-
|-
| Desktop || - || - || Tracking
| Desktop || Synced tab groups || [https://connect.mozilla.org/t5/ideas/synced-work-spaces-or-synced-tab-groups/idi-p/22999#U22999] || Tracking
|-
| Desktop || Customizable bookmark toolbar font || [https://connect.mozilla.org/t5/ideas/allow-for-bookmarks-toolbar-font-size-customization-or-auto/idi-p/10073] || Tracking
|-
| Desktop || Customizable hotkeys || [https://connect.mozilla.org/t5/ideas/customizable-hotkeys/idi-p/4979#U4979] || Tracking
|-
| Desktop || Differentiate "Site you save" and "Sites you visit" in new tab || [https://connect.mozilla.org/t5/ideas/please-split-quot-sites-you-save-and-visit-quot-into-two-options/idi-p/12734] [https://www.reddit.com/r/firefox/comments/1kxp38p/i_think_the_sticker_icon_on_shortcuts_in_the_new/] || Tracking
|-
| Android || Android address bar is too cluttered || [https://connect.mozilla.org/t5/discussions/address-bar-clutter-and-lack-of-customization-options-in-firefox/m-p/97849] [https://www.reddit.com/r/firefox/comments/1l26s5d/now_on_the_android_firefox_browser_the_risk_of/] [https://www.reddit.com/r/firefox/comments/1llnus0/too_much_buttons/] [https://www.reddit.com/r/firefox/comments/1ln3erk/they_could_have_made_it_the_refresh_button/] [https://www.reddit.com/r/firefox/comments/1lmk1a2/is_it_possible_to_hide_some_of_the_buttons_in_the/] || Tracking
|-
| Android || Add a setting to enable tab strip || [https://connect.mozilla.org/t5/ideas/tab-strip-horizontal-tab-bar-for-firefox-mobile-phone/idi-p/77487 Connect][https://bugzilla.mozilla.org/show_bug.cgi?id=1971868 Bugzilla] || Tracking
|-
| iOS || Default page zoom setting || [https://github.com/mozilla-mobile/firefox-ios/issues/15058] || In progress
|-
| iOS || Translate feature in Firefox for iOS || [https://connect.mozilla.org/t5/ideas/translate-in-ios/idi-p/8092] || Tracking
|}
|}
-->
 
For other top requests on Mozilla Connect, please check out [https://connect.mozilla.org/t5/discussions/mozilla-connect-weekly-recap-top-voted-ideas-6-13-6-20/td-p/99126]


== Known issues ==
== Known issues ==
<!--
{| class="wikitable"
{| class="wikitable"
|-
|-
! Platform !! Issue !! Known bug/Related discussions !! Fix/workaround
! Platform !! Category !! Issue !! Known bug/Related discussions !! Fix/workaround
|-
| Desktop || Webcompat || www.xfinity.com/stream stucks loading || [https://bugzilla.mozilla.org/show_bug.cgi?id=1977318 bug1977318] || Enable uBlock Origin
|-
| Desktop || Crashes || Startup crashes caused by MS's Family Safety feature || [https://support.mozilla.org/questions/1519024#answer-1746166] || turn off the Family Safety feature temporarily
|-
| Desktop || Webcompat || NYT tells me I am a bot and will not let me read articles || [https://webcompat.com/issues/162420 #162420] || Disable extensions
|-
| Desktop || Webcompat || Facebook audio and video call isn't working in Firefox || [https://bugzilla.mozilla.org/show_bug.cgi?id=1896361 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. || [https://bugzilla.mozilla.org/show_bug.cgi?id=1968040 bug1968040] || A fix is coming in v141
|-
| Desktop || Media || Taskbar Appearing when playing Full Screen Videos || [https://bugzilla.mozilla.org/show_bug.cgi?id=1965699 bug1965699] || Change widget.windows.fullscreen_marking_method to 0, 1, 2, or 3; a fix is coming in v141
|-
|-
| Desktop || - || - || -
| Desktop || UI/UX || Switching search engines on a new address bar || [https://www.reddit.com/r/firefox/comments/1ljnq44/bring_back_search_engines_in_url_suggestion_bar/] [https://www.reddit.com/r/firefox/comments/1ljgbdb/switching_search_engines_on_a_new_address_bar/] || Use keyword shortcut (e.g. @google, @ddg) on the new address bar
|-
|-
| Android || - || - || -
| Android || UI/UX || Back button jumps to first entry in tab's history rather than previous entry || [https://bugzilla.mozilla.org/show_bug.cgi?id=1958609 bug1958609] || Fixed in v139
|-
|-
| iOS || - || - || -
| Android || UI/UX ||Don't show the empty state while bookmarks are loading || [https://bugzilla.mozilla.org/show_bug.cgi?id=1957713 bug1957713] || Fixed in v140
|-
| Android || Security||Unexpected client auth certificate request dialogs || [https://bugzilla.mozilla.org/show_bug.cgi?id=1966033 bug1966033] || Fixed in v140
|-
| Android || UI/UX ||Bogus message: I'm a temporary text to indicate you're on the new Tab Fragment || [https://bugzilla.mozilla.org/show_bug.cgi?id=1976648 bug1976648] || Will be fix in v142
|-
| Android || UI/UX || spacebar and backspace working abnormaly in google search bar with gboard || [https://bugzilla.mozilla.org/show_bug.cgi?id=1968872 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 ==
== Known incidents ==
{| class="wikitable"
!colspan="2"| 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:'''
|[https://bugzilla.mozilla.org/show_bug.cgi?id=1971487]
|-
|'''Resolution/workaround:'''
| Fixed in 140.0.1
|}
{| class="wikitable"
!colspan="2"| 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
|}
{| class="wikitable"
!colspan="2"| Deep links stopped working on Android 140.0
|-
|'''Description:'''
| Firefox for Android users on version 140 were unable to leverage protocol URIs.
|-
|'''Status:'''
| Resolved
|-
|'''Product(s) impacted:'''
| Firefox for Android
|-
|'''Associated bug:'''
| https://bugzilla.mozilla.org/show_bug.cgi?id=1974569
|-
|'''Resolution/workaround:'''
| Update to version 140.0.3 should fix this issue
|}
<!--
<!--
{| class="wikitable"
{| class="wikitable"

Latest revision as of 04:00, 22 July 2025


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:

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

Dot releases

Platform Version Release date Notable fixes Unresolved
Firefox Desktop 140.0.1 June 26, 2025 bug1971487, bug1973947 bug1968040
Firefox & Focus for iOS 140.1 June 26, 2025 Various stability fixes -
Firefox Desktop 140.0.2 June 28, 2025 bug1974259
Firefox & Focus for Android 140.0.3 July 1, 2025 bug1956165, bug1974569 -
Firefox Desktop 140.0.4 July 8, 2025 bug1971053, bug1971094
Firefox & Focus for Android 140.0.4 July 8, 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

Updates for extensions menu in toolbar (win only)
Description: Users can now hide the extensions menu in the toolbar.
Content request: [1]
KB articles: https://support.mozilla.org/kb/extensions-button Articles update
https://support.mozilla.org/kb/how-stop-firefox-making-automatic-connections
https://support.mozilla.org/kb/unable-install-add-ons-extensions-or-themes
https://support.mozilla.org/kb/use-themes-change-look-of-firefox
https://support.mozilla.org/kb/troubleshoot-extensions-themes-to-fix-problems
https://support.mozilla.org/kb/disable-or-remove-add-ons
https://support.mozilla.org/kb/reporting-extensions-and-themes-abuse
https://support.mozilla.org/en-US/kb/re-enable-add-ons-disabled-when-updating
https://support.mozilla.org/en-US/kb/built-themes-firefox-alternative-complete-themes
https://support.mozilla.org/en-US/kb/how-update-add-ons
https://support.mozilla.org/en-US/kb/if-another-extension-interferes-mozilla-vpn
https://support.mozilla.org/en-US/kb/review-installed-extensions
https://support.mozilla.org/en-US/kb/extensions-private-browsing
https://support.mozilla.org/en-US/kb/find-and-install-add-ons-add-features-to-firefox
https://support.mozilla.org/en-US/kb/manage-extension-shortcuts-firefox
https://support.mozilla.org/en-US/kb/personalized-extension-recommendations
https://support.mozilla.org/en-US/kb/extension-changed-my-new-tab-page
https://support.mozilla.org/en-US/kb/manage-optional-permissions-extensions
https://support.mozilla.org/en-US/kb/add-ons-cause-issues-are-on-blocklist
https://support.mozilla.org/en-US/kb/troubleshoot-issues-related-to-add-ons
https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox
https://support.mozilla.org/en-US/kb/access-your-add-ons-firefox-accounts
https://support.mozilla.org/en-US/kb/extensions-private-browsing
https://support.mozilla.org/en-US/kb/add-on-badges
https://support.mozilla.org/en-US/kb/quarantined-domains
https://support.mozilla.org/en-US/kb/cannot-remove-add-on-extension-or-theme
https://support.mozilla.org/en-US/kb/remove-toolbar-has-taken-over-your-firefox-search
https://support.mozilla.org/en-US/kb/get-started-firefox-overview-main-features
https://support.mozilla.org/en-US/kb/recommended-extensions-program
https://support.mozilla.org/en-US/kb/facebook-container-isnt-working
https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings
https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
https://support.mozilla.org/en-US/kb/facebook-container-prevent-facebook-tracking
https://support.mozilla.org/en-US/kb/what-search-hijacking
https://support.mozilla.org/en-US/kb/firefox-advanced-customization-and-configuration
https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox
https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account
https://support.mozilla.org/en-US/kb/change-your-default-search-settings-firefox
https://support.mozilla.org/en-US/kb/warning-unresponsive-script
https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
https://support.mozilla.org/en-US/kb/use-troubleshooting-information-page-fix-firefox
https://support.mozilla.org/en-US/kb/how-reset-default-user-agent-firefox
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] [19] [20] [21] Tracking
Android Add a setting to enable tab strip ConnectBugzilla Tracking
iOS Default page zoom setting [22] In progress
iOS Translate feature in Firefox for iOS [23] Tracking

For other top requests on Mozilla Connect, please check out [24]

Known issues

Platform Category Issue Known bug/Related discussions Fix/workaround
Desktop Webcompat www.xfinity.com/stream stucks loading bug1977318 Enable uBlock Origin
Desktop Crashes Startup crashes caused by MS's Family Safety feature [25] turn off the Family Safety feature temporarily
Desktop Webcompat NYT tells me I am a bot and will not let me read articles #162420 Disable extensions
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 Change widget.windows.fullscreen_marking_method to 0, 1, 2, or 3; a fix is coming in v141
Desktop UI/UX Switching search engines on a new address bar [26] [27] 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 Bogus message: I'm a temporary text to indicate you're on the new Tab Fragment bug1976648 Will be fix in v142
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: [28]
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
Deep links stopped working on Android 140.0
Description: Firefox for Android users on version 140 were unable to leverage protocol URIs.
Status: Resolved
Product(s) impacted: Firefox for Android
Associated bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1974569
Resolution/workaround: Update to version 140.0.3 should fix this issue


Post-release

Retrieved from "https://wiki.mozilla.org/index.php?title=Support/Firefox140&oldid=1254631"