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Click on the operating system on which you are installing Firefox.
How to install Firefox on Windows
How to download and install Firefox on Mac
Install Firefox on Linux
Install Firefox on an Android device using Google Play
Based on information from Installing Firefox (mozillaZine KB)
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Mac® and the Apple logo are trademarks of Apple Inc., registered in the U.S. and other countries.
Linux® is the registered trademark of Linus Torvalds in the U.S. and other countries.
The Linux logo is Copyright 1997 Larry Ewing
The Android logo is based on work created and shared by Google.