You can customize Firefox in many ways. This article explains how to customize Firefox controls, buttons and toolbars.
Zoom is a feature which allows you to increase or decrease either the size of a web page or the size of the text. This article explains how it works.
A theme is a type of add-on which changes the visual appearance of Firefox. Learn how to find, install, and manage themes in Firefox.
Learn how to use the Bookmarks toolbar in Firefox for quick access to often-used bookmarks.
This article describes how to customize the way you see websites by choosing font styles and colors that will override those used by the websites.
The Firefox Menu bar (File, Edit, View, History, Bookmarks, etc.) may be hidden or missing. Learn how to restore the Menu bar.