Install and update
Download or update Firefox for Windows, Mac and Linux.
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.
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.
Will Firefox version 100 work on Windows 7?
On Windows 7, Microsoft update KB4474419 is needed to install Firefox 100 or above without any issues. Learn more.
