Try one of these articles:
- 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.
- Block and unblock websites with parental controls This article lists resources for blocking children from using Firefox, certain websites or certain content that may be offensive or inappropriate.
- Viewing HTML5 audio and video in Firefox You can play some types of audio and video files without a plugin like Flash. This article explains which formats can be played and how to save and open them.