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What Windows 10 end of support means for Firefox users

Learn how Firefox will continue supporting Windows 10 after Microsoft ends its updatesand discover the steps Mozilla recommends to keep your browsing experience secure.

Last updated: 2/13/26

Update Firefox to the latest release

Firefox automatically updates itself by defaultbut you can always do a manual update. Learn how to update Firefox on WindowsMacor Linux.

Last updated: 10/10/25

Firefox support for Windows 78 and 8.1

Firefox version 115 ESR will be the last supported release for Windows 78 and 8.1.

Last updated: 3/8/26

How to install Firefox on Windows

This article describes how to download and install Firefox on Windows.

Last updated: 2/24/26

Windows 10 warns me to use a "Microsoft-verified" app

Windows 10 may interrupt your Firefox install with a “Microsoft-verified apps” warning. Firefox is safe to installso choose “install anyway”.

Last updated: 2/26/26

How to download and install Firefox on Mac

This article explains how to download and install Firefox on macOS.

Last updated: 2/24/26

Back up and restore information in Firefox profiles

Firefox stores your personal data and settings in a profile folder. Learn how to back up and restore this important information.

Last updated: 10/19/25

Firefox security features warning on Linux

Create an AppArmor profile for Firefox on Linux.

Last updated: 3/5/25

Install Firefox on Linux

This article describes how to download and install Firefox on Linux.

Last updated: 1 week ago

Custom installation of Firefox on Windows

The custom setup option in the Firefox fulloffline installer lets you choose the program folder location and shortcuts. Learn more.

Last updated: 2/26/26

Firefox users on macOS 10.1210.13 and 10.14 moving to Extended Support Release

Firefox version 115 ESR will be the last supported release for macOS 10.1210.13 and 10.14

Last updated: 3/8/26

Uninstall Firefox from your computer

This article describes how to uninstall the Firefox application from your computer and also how to remove the personal information that Firefox stores.

Last updated: 2/22/26

Download Firefox on Windows from the Microsoft Store

The "Mozilla Firefox" app is available from the Microsoft Store for Windows 10 and Windows 11. Learn how to install it.

Last updated: 5/14/24

Firefox has ended support for Windows XP and Vista

Firefox version 52.9.0 ESR was the last supported release for Windows XP and Windows Vista. No further security updates will be provided for those systems.

Last updated: 11/26/23

Enable background updates on Firefox for Windows when Firefox is not running

On Windowsyou can set Firefox to update in the background even when it isn't runningso you always have the latest version. Learn more.

Last updated: 12/27/24

Install an older version of Firefox

Downgrading to a previous Firefox version doesn't solve most problems. This article links to older versions and provides some alternatives.

Last updated: 2 weeks ago

Run Firefox on ChromeOS

This page explains how to install Firefox on Chromebooks and other devices running ChromeOS.

Last updated: 2/27/26

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.

Last updated: 4/2/23

Switch from Chrome to Firefox

Firefox can automatically move bookmarkspasswordshistory and other preferences from Chrome without deleting it or interfering with any of its settings.

Last updated: 8/8/25

Recover user data missing after Firefox update

If your bookmarkspasswordspreference settings and other data are missingit may be available in another Firefox profile. Learn more.

Last updated: 11/21/22

Troubleshoot Firefox updates and the Helper tool

Learn what to do if you get a "Firefox is trying to install a new helper tool" message while updating Firefox on macOS.

Last updated: 6/10/25

How the Firefox desktop launcher works

Understand how the Firefox desktop launcher helps restore Firefox after restoring with One Drive.

Last updated: 1/23/26

Update Firefox to prevent add-ons issues from root certificate expiration

A root certificate that expired March 142025 can cause issues with add-onsDRM media and essential featuresunless you update Firefox.

Last updated: 3/18/25

I found a fake Firefox update

What to do if you spot fake notices claiming to contain an "urgent" or "critical" Firefox update.

Last updated: 6 days ago

Windows in S mode won't let me install Firefox

You cannot install Firefox from Mozilla or from the Microsoft Store on Windows in S mode. You must first switch out of S mode. Learn more.

Last updated: 9/24/25

Importing Safari data into Firefox

Learn now to import data such as bookmarksbrowsing historyand custom preferences from your Safari browser into Firefox.

Last updated: 10/11/25

Firefox has ended support for 32-bit Linux

Support for Firefox on 32-bit Linux is ending.

Last updated: 9/27/25

Why do I get a harmful download message when downloading Firefox on Windows?

You may see a warning that the installer could harm your device when attempting to download Firefox from another browser. Learn more.

Last updated: 7/14/23

Resolve “The installation seems to be incomplete/corrupt” error in Firefox on Windows

Fix the “installation incomplete/corrupt” error in Firefox on Windows by addressing common causes like corrupted files or hardware issues.

Last updated: 9/25/24

Find what version of Firefox you are using

Learn how to find out what Firefox version you are usingto help troubleshoot a problem or just to know if Firefox is up to date.

Last updated: 16 hours ago

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 on your Windows or Linux computer? This article explains how to find out.

Last updated: 8/27/21

64-bit Firefox crashes with Citrix's XenApp VM

The API hooks from Citrix XenApp 7.13 VDA do not work with 64-bit Firefox. How to find a workaround.

Last updated: 6/30/17

Supported platforms and system requirements

Firefox desktop should be installed on systems meeting minimum requirements for best performance.

Last updated: 11/6/24

Firefox Mac OS X 10.910.10 and 10.11 users move to Extended Support Release

Firefox 78 was the last supported version for Mac OS X 10.910.10 and 10.11. Users were moved to Firefox Extended Support Release (ESR).

Last updated: 1/7/26

Solutions for "Can not create temp folder archive" error when installing Firefox (Windows 10)

Stuck with the "Can not create temp folder archive" error on 7-Zip when installing Firefox for Windows 10? This article will help you to solve the issue.

Created: 6/6/21

Firefox update notifications on Windows

Learn about update notifications on Windows that let you know when a brand-new Firefox version is availableeven if Firefox is closed.

Last updated: 9/30/24

Firefox release notes - What's new and known issues

Links to Firefox release notes for DesktopAndroid and iOS.