Installation and updates

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".

Last updated: 4/26/23

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.

Last updated: 9/26/24

How to install Firefox on Windows

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

Last updated: 9/28/24

Firefox users on Windows 7, 8 and 8.1 moving to Extended Support Release

Firefox version 115 ESR will be the last supported release for Windows 7, 8 and 8.1.

Last updated: 10/3/24

Back up and restore information in Firefox profiles

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

Last updated: 9/3/24

How to download and install Firefox on Mac

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

Last updated: 8/3/24

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

Run Firefox on ChromeOS

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

Last updated: 10/8/24

Profile Manager - Create, remove or switch Firefox profiles

Firefox stores your personal information and settings in a profile folder. Learn to work with different profiles on Firefox.

Last updated: 3 weeks, 6 days ago

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.

Last updated: 6/4/23

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

Update to Firefox 128+ by March 14, 2025, to avoid issues with add-ons, DRM media and essential features due to an expiring root certificate.

Last updated: 2 weeks, 6 days ago

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: 9/3/24

Custom installation of Firefox on Windows

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

Last updated: 2/26/22

Recovering important data from an old profile

If you need to create a new Firefox profile, find out how to recover your old Firefox data such as bookmarks, history and passwords.

Last updated: 1/18/24

Firefox users on macOS 10.12, 10.13 and 10.14 moving to Extended Support Release

Firefox version 115 ESR will be the last supported release for macOS 10.12, 10.13 and 10.14

Last updated: 3 weeks, 4 days ago

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

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: 6/6/22

Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release

Firefox 78 was the last supported version for Mac OS X 10.9, 10.10 and 10.11. Users were moved to Firefox Extended Support Release (ESR).

Last updated: 1/7/22

Install Firefox on Linux

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

Last updated: 2 weeks, 5 days ago

Profiles - Where Firefox stores your bookmarks, passwords and other user data

Firefox stores your personal information and settings in a profile folder. Find out what is in your profile and how to locate it.

Last updated: 4 days, 7 hours ago

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: 1 week, 4 days ago

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

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.

Last updated: 11/21/22

Importing Safari data into Firefox

Import data from your Safari browser into Firefox. You must enable Full Disk Access on macOS version 10.14 (Mojave).

Last updated: 7/26/23

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

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

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: 3/5/22

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

On Windows, you can set Firefox to update in the background even when it isn't running, so you always have the latest version. Learn more.

Last updated: 2 weeks, 6 days ago

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

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

Supported platforms and system requirements

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

Last updated: 4 days, 10 hours ago

Firefox release notes - What's new and known issues

Links to Firefox release notes for Desktop, Android and iOS.

Last updated: 1/5/23

Search Support