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Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

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Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release. 143.0.1 Firefox Release

September 19, 2025 Version 143.0.1, first offered to Release channel users on September 19, 2025 Fixed

   Fixed a tab crash experienced by some users caused by DLL injection. (Bug 1872261)

   Reference link to 143.0 release notes.

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Putting people before profits since 1998 ___________________________________________________ Wierd. Thanks. Greg

I've been unable to sign in or send messages through certain sites. Put Firefox in troubleshooting mode and everything seems to be working correctly. How can you tell what settings need to be changed to keep it working correctly? Or should I just leave the browser in troubleshooting mode? Thanks. Jim

When I go to YouTube to watch videos the Vid's always stop after a short time. The refresh page and back buttons do not work and neither does the ability to click on any links on the page. I have to close the tab and start again. The issues still occur on new tabs. Eventually I have to close FireFox altogether but when I try to open FireFox again it does not work or takes a few minutes and sometimes the message Firefox is still running. At times I have had the sound of the videos, when they do play, from YouTube still playing even when the browser is closed.

I am having problems with Firefox not scrolling (and no scroll bar) on some web pages. The following is an examble:

https://www.lv.com/insurance/supporting-you/driving-tips?sfmc_id=648966069

I am using Windows 10 and Firefox 143.0.3 (64-bit)

Any help would be appreciated.

Two QNAP NAS displayed readable web pages this morning. Early afternoon I updated Firefox with a reset and the admin pages on both servers are unusable. How can I roll back Firefox or recover the earlier version?

Hi After browsing a particular web site the Firefox browser froze with a single search control on the page and all items frozen. Tried to fix it through settings but no response. See attached screenshot. Refreshed Firefox from Control panel->Programs and Features->Uninstall->Refresh Firefox. This reset Firefox and fixed the problem however the Firefox browser lost several settings and add-ons which I had to manually fix. Glad it is mostly all working again!

Здравствуйте. Сайты с сервисами от компании Яндекс не работают - не грузятся. Пробовал почистить куки, перезагрузиться, не помогает. Открыл в новом приватном окне, все заработало. В чём может быть дело? Работать в приватном окне - не удобно.