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Firefox 155 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

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 155.0 Release Notes
• ESR 153.2.0 Release Notes
• ESR 140.15.0 Release Notes
• ESR 115.40.0 Release Notes
• Firefox for developers 155 Release Notes
• Firefox for Android 155.0 Release Notes
• Firefox for iOS 155.0 Release Notes

Dot releases

TBD

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

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 155

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

Firefox Desktop content update

VPN - End of Summer promotion
Description:	Update VPN article to remove summer promotion
Content request:	bug 2063035
KB article:	built-in-vpn	Article update

Smart window expansion to France and Mistral update
Description:	Smart window is expanding to France
Content request:	bug 2060632, bug 2060618
KB articles:	smart-window	Article updates & new article
	smart-window-safety
	smart-window-memories
	smart-window-byom
	smart-window-user-feedback
	smart-window-models

Firefox for Android content update

No content update for this release.

Firefox for iOS content update

No content update for this release.

Known studies/experiments

Platform	Studies/experiments	Description	Size	Related discussions	Forum tag
Firefox for iOS	Address bar interactive gesture to open the tab tray	This enables the interactive gesture on the bottom address bar. The user can drag the address bar interactively and open the tab tray or delete the current dragged tab.	20%	-	UI/UX

Top requests

Check out top voted requests on Mozilla Connect.

Known incidents

HTTP/3 Sites Fail to Load When UDP Is Blocked
Description:	Firefox fails to load some sites with network.http.happy_eyeballs_enabled=true on Zscaler proxy
Status:	Ongoing
Product(s) impacted:	Firefox Desktop
Associated bug:	[1]
Resolution/workaround:	We revert the changes temporarily per Aug 31 through Nimbus