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.
The custom setup option in the Firefox full, offline installer lets you choose the program folder location and shortcuts. Learn more.
This article describes how to download and install Firefox on Linux.
Downgrading to a previous Firefox version doesn't solve most problems. This article links to older versions and provides some alternatives.
Firefox stores your personal information and settings in a profile folder. Find out what is in your profile and how to locate it.
If you need to create a new Firefox profile, find out how to recover your old Firefox data such as bookmarks, history and passwords.
Firefox stores your personal information and settings in a profile folder. Learn how to back up and restore this important data.
Firefox stores your personal information and settings in a profile folder. Learn to work with different profiles on Firefox.
This article explains how to download and install Firefox on a Mac.
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.
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.
Enable Full Disk Access on macOS version 10.14 (Mojave) or higher, so that you can import data from your Safari browser into Firefox.
This page explains how to install Firefox on Chromebooks and other devices running ChromeOS.
On Windows 7, Microsoft update KB4474419 is needed to successfully install Firefox 100 or above. Learn more.