Support/Firefox133

Firefox 133 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

Release notes

• Desktop 133.0 Release Notes
• ESR 115.18.0 Release Notes
• ESR 128.5.0 Release Notes
• Firefox for Enterprise 133 Release Notes
• Firefox for developers 133 Release Notes
• Firefox for Android 133.0 Release Notes
• Firefox for iOS 133.0 Release Notes

Bug boards

• Desktop bug board
• Mobile bug board

Dot releases

Platform	Version	Release date	Notable fixes	Unresolved
Firefox for iOS	133.2	December 6, 2024	Fixing the onboarding crash issue (see incident section below)	-
Firefox Desktop	133.0.3	December 10, 2024	bug1934482, bug1930840, bug1933668, bug1934238	-
Firefox & Focus for Android	133.0.3	December 10, 2024	Various bug fixes	-
Firefox for iOS	133.3	December 11, 2024	Minor fix	-
Firefox ESR	ESR128.5.2 ]	December 12, 2024	crash caused by third-party software (bug1934258)	-

Contributor discussions

Please refer to the following contributor forum threads to learn more about known issues and discuss with other contributors:

• Desktop release discussion
• Mobile release discussion
• Localization discussion
• Support release scrum meeting

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 a week before Firefox release date). Check our schedule here and don't hesitate to join the call in person if you can!
• Firefox pod meeting: If you’re an NDA’d contributor, you can watch the recording of our Firefox Pod Meeting from AirMozilla to catch up with the latest train release. You can also subscribe to the AirMozilla folder by clicking on the Subscribe button in the top-right corner of the page to get notifications each time we add a new recording.
• Newsletter: Consider subscribing to Firefox Daily Digest to get daily updates (Mon-Fri) about Firefox from across the internet.

Content in this page is being updated periodically as we're rolling out the release.

What's new in Firefox 133

Firefox Desktop

Tab overview menu update
Description:	We're adding the “Tabs from other devices” menu in the Tab Overview list.
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1931890
KB articles:	https://support.mozilla.org/en-US/kb/tab-overview-menu/	KB updated

Update KB ETP Article to include Bounce Tracking Protection
Description:	We're shipping Bounce Tracking Protection in ETP strict in Fx133.
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1931837
KB articles:	https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop	KB updated

“permission-request-messages-firefox-extensions” and ”extensions-private-browsing” Update
Description:	Updating the dialog screenshot for when a user installs an extension.
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1917044
KB articles:	https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions/history	KB updated
	https://support.mozilla.org/en-US/kb/extensions-private-browsing/history

Firefox for Android

Desktop mode by default for Firefox for Android Tablet Users
Description:	Desktop mode browsing is now enabled by default for large devices. This can be controlled via a preference under Settings in “Site settings” previously named “Site permissions”.
Content request:	https://bugzilla.mozilla.org/show_bug.cgi?id=1923952
KB article:	https://support.mozilla.org/en-US/kb/getting-started-firefox-android-tablet-browser	Article updated

Firefox for iOS

No content update on iOS

Escalation

TBD

Known issue(s)/Trending topic(s)

Platform	Issue	Known bug/Related discussions	Fix/workaround
Desktop ESR 128.5.0	ESR 128.5.0 not loading pages/websites when using SSL inspection	https://bugzilla.mozilla.org/show_bug.cgi?id=1933747	Update to 128.5.1 should fix the issue.
Android	-	-	-
iOS	-	-	-

Known incident(s)

Runtime exception crash in android beta
Description:	Users experience crashes opening home screen shortcuts for private tabs, or looking at crashes in settings
Status:	Resolved as per #1935620
Product(s) impacted:	Firefox for Android
Associated bug:	https://bugzilla.mozilla.org/show_bug.cgi?id=1935391
Resolution/workaround:	Fixed with https://bugzilla.mozilla.org/show_bug.cgi?id=1935620

Onboarding crash in Firefox iOS 133.1
Description:	a subset of users may be experiencing a crash loop during onboarding flow after launching Firefox iOS 133.1
Status:	Resolved with 133.2 update
Product(s) impacted:	Firefox for iOS
Associated bug:	https://github.com/mozilla-mobile/firefox-ios/issues/23621
Resolution/workaround:	Upgrade to v133.2

18.2 (Beta) startup crash in Firefox for iOS 133.3
Description:	133.3 users on certain 18.2 beta builds that doesn't have the DMA api are crashing
Status:	On going
Product(s) impacted:	Firefox for iOS
Associated bug:	https://github.com/mozilla-mobile/firefox-ios/issues/23819
Resolution/workaround:	Fix is on the way

Post-release

• To come