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Firefox 91 SUMO Sprint

What is SUMO Sprint?

SUMO Day/SUMO Sprint is that time of the week when the whole Mozilla community comes together to answer incoming questions on the support forum for Firefox, Firefox for Android, and Firefox for iOS users. Check out this page to learn more about it.

What's new in Firefox 91


Description KB link Status
Updated to reflect Total Clearing Updated
Updated for resurfaced Simplified printing feature Updated
Windows Single Sign-On feature8 Created
Update to reflect HTTPS-First Mode Updated


Description KB link Status
How to set Firefox as default browser from the notifications Created
What's new in Firefox for Android 91 Updated


Find out more

Dot releases

Heads up

  • We removed pref to disable proton in Firefox 91

Known issues

How to get involved in the sprint?

Join us in our community portal event and contribute by:

  • Answer forum questions
  • Respond to actionable tweets

Answer forum questions

Many people visit our forum to ask questions about Firefox. You can contribute by answering their questions directly on the forum, or using the SUMO Live Helper addon created by SUMO contributors.

Respond to actionable tweets

You can also help many people who are having problems with their Firefox by responding to actionable tweets (meaning that the tweet expressed that somebody need support). Check out this article or take this short course to know more about how you can help people on Twitter. We strongly recommend existing community members to use Conversocial to reply to tweets from the official support account, @FirefoxSupport.

How can I get more help?

You can join our Matrix channel to ask questions/join community discussion.