Install and update
How to install Firefox and keep it up to date
Update Firefox to the latest release
Firefox automatically updates itself by default but you can always do a manual update. Learn how to update Firefox on Windows, Mac or Linux.
How to download and install Firefox on Windows
This article describes how to download and install Firefox on Windows.
Windows 10 warns me to use a "Microsoft-verified" app
Windows 10 may interrupt your Firefox install with a warning about "Microsoft-verified apps". Firefox is safe to install and use, so choose "install anyway".
Firefox has ended support for Windows XP and Vista
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.
Find what version of Firefox you are using
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.
Install Firefox on Linux
This article will show you how to install Firefox on Linux.
How to download and install Firefox on Mac
This article explains how to download and install Firefox on a Mac.
Install an older version of Firefox
Downgrading usually doesn't solve Firefox problems. This article gives you links to old versions of Firefox and provides some alternatives to downgrading.
Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release
Firefox 78 is the last supported version for Mac OS X 10.9, 10.10 and 10.11. Users will be moved to Firefox Extended Support Release (ESR).
What is the Mozilla Maintenance Service?
Firefox and Thunderbird install Mozilla Maintenance Service to allow seamless background updates. Learn how it works and how to disable or remove it.
Uninstall Firefox from your computer
This article describes how to remove the Firefox application from your computer and also how to remove the personal information that Firefox stores.
Upgrading to the new version of Firefox (84+) on Apple Silicon
How to make sure you're using the Apple Silicon version of Firefox.
Firefox support has ended for Mac OS X 10.6, 10.7 and 10.8
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 won't let me install Firefox
Windows 10 S Mode can only run applications downloaded from the Windows Store.
Recover user data missing after Firefox update
If your bookmarks, passwords, preference settings and other data are missing, it may be available in another Firefox profile. Learn more.
I found a fake Firefox update
What to do if you spot fake notices claiming to contain an "urgent" or "critical" Firefox update.
How do I tell if I have the 32-bit or 64-bit Firefox?
Not sure whether you're running 32-bit or 64-bit Firefox? This article explains how to find out.
Switch to Firefox Extended Support Release (ESR) for personal use
How to switch to Firefox ESR as a workaround for issues with the newest version of Firefox.
Firefox release notes - What's new and known issues
Links to release notes for Firefox and Firefox for Android.
