Try one of these articles:
- How to download and install Firefox on Windows This article describes how to install Firefox on Windows.
- How to download and install Firefox on Mac This article explains how to download and install Firefox on a Mac.
- Profiles - Where Firefox stores your bookmarks, passwords and other user data Firefox stores your personal information and settings in a profile folder. This article explains the details of what is in your profile and how to locate it.
- Does Firefox work on Windows 8 and Windows RT? This article explains which versions of Windows 8 that Firefox is compatible with.