Firefox automatically updates itself by default but you can always do a manual update. Learn how to update Firefox on Windows, Mac or Linux.
This article describes how to download and install Firefox on Windows.
This article will show you how to install Firefox on Linux.
Firefox version 52.9.0esr was the last supported release for Windows XP and Windows Vista. No further security updates will be provided for those systems.
Learn how to find out what Firefox version you are using, to help troubleshoot a problem or just to know if Firefox is up to date.
Downgrading usually doesn't solve Firefox problems. This article gives you links to old versions of Firefox and provides some alternatives to downgrading.
This article explains how to download and install Firefox on MacOS.
Firefox and Thunderbird install Mozilla Maintenance Service to allow seamless background updates. Learn how it works and how to disable or remove it.
This article describes how to remove the Firefox application from your computer and also how to remove the personal information that Firefox stores.
Firefox version 49 and above are no longer supported on Mac OS X 10.6, 10.7 and 10.8. Learn more about your options.
Windows 10 S Mode can only run applications downloaded from the Windows Store.
Not sure whether you're running 32-bit or 64-bit Firefox? This article explains how to find out.
What to do if you spot fake notices claiming to contain an "urgent" or "critical" Firefox update.
How to switch to Firefox ESR as a workaround for issues with the newest version of Firefox.
Firefox 78 is the last supported version for macOS 10.9, 10.10 and 10.11. Users will be moved to Firefox Extended Support Release (ESR).
If your bookmarks, passwords, preference settings and other data are missing, it may be available in another Firefox profile. Learn more.
Links to release notes for Firefox and Firefox for Android.