Try one of these articles:
- Update Firefox to the latest version Firefox automatically updates itself by default but you can always do a manual update. Learn how to update Firefox on Windows, Mac or Linux.
- 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.
- Install Firefox on Linux This article will show you how to install Firefox on Linux.
- How to download and install Firefox on Windows This article describes how to download and install Firefox on Windows.