Hi there, where did you download your Firefox from? The latest version of Firefox is compatible with Windows 11. To install Firefox, you can check out the following articles based on your platform or operating system you're using. * [[How to install Firefox on Windows|Install Firefox on Windows]] * [[Download Firefox on Windows from the Microsoft Store|Download Firefox on Windows from the Microsoft Store]] * [[How to download and install Firefox on Mac|Install Firefox on Mac]] * [[Install Firefox on Linux|Install Firefox on Linux]] * [[Install Firefox on an Android device using Google Play|Install Firefox on Android device using Google Play]] * [[Install Firefox on your iPad, iPhone or iPod|Install Firefox on iPad, iPhone, or iPod]] To update Firefox to the the latest version, please check out: * [[Update Firefox to the latest release]] (desktop Firefox) * [[Update to the latest version of Firefox for Android]]