Try one of these articles:
- Learn more about the design of the new Firefox Firefox has a new streamlined interface as well as features to make it more efficient and easier to customize. We'll look at the thinking behind these changes.
- How to make web links open in Firefox by default Make web links open in Firefox automatically by setting it as the default browser on your computer. This article explains how to do that.
- Customize Firefox controls, buttons and toolbars Firefox is easy to customize. Put your favorite features right where you want them. We'll show you how.
- How to sync your add-ons with another copy of Firefox This article contains steps for enabling add-on synchronization across devices.