Installation and updates
Learn how to install your favorite Mozilla products and keep them updated.
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".
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Install Firefox on Linux
This article describes how to download and install Firefox on Linux.
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1 week, 5 days ago
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.
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How to install Firefox on Windows
This article describes how to download and install Firefox on Windows.
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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.
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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.
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How to download and install Firefox on Mac
This article explains how to download and install Firefox on macOS.
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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.
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4 weeks, 1 day ago
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.
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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.
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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.
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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.
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Run Firefox on ChromeOS
This page explains how to install Firefox on Chromebooks and other devices running ChromeOS.
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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.
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I found a fake Firefox update
What to do if you spot fake notices claiming to contain an "urgent" or "critical" Firefox update.
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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.
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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.
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1 week, 5 days ago
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
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2 weeks, 3 days ago
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.
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2 weeks, 5 days ago
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).
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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.
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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.
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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).
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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.
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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.
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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.
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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.
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1 week, 5 days 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.
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3 days, 7 hours ago
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.
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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.
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Firefox release notes - What's new and known issues
Links to Firefox release notes for Desktop, Android and iOS.
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