First introduced in Mozilla Firefox 5.0, the App Tab feature allows Firefox users to pin their favorite tabs to their tabs toolbar. App Tabs can be extremely useful for users who always have a tab open to a social networking website, their website, or any site they frequently visit. In the picture below, is an example of four App Tabs in Firefox.

App, Firefox, Internet terms

  • Quickly pin and unpin browser tabs.
  • Quickly close other tabs in a browser.
  • How to duplicate a tab in an Internet browser.
  • See our pin and tab definitions for further information and related links.