Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
The first and only download manager/accelerator built inside Firefox!
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
Automatically find user scripts on Userscripts.org (requires Greasemonkey or Scriptish)
Displays a progress bar of your Internet usage (grabbed from your ISP) on your Firefox Toolbar.
Allows you to open any file from the internet into the OS assigned program. This is similar to IE's 'Open' or 'Run' file download functionality. ...
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