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).
A customizable mouse gestures extension which enables to execute various commands and user scripts with six types of gestures.
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
A productive way to organize, read and share the content of your favorite feeds, blogs and news sites. Feedly offers a seamless transition from Google Reader.
Note from Mozilla: This add-on has been discontinued. Try WebMail Notifier instead.
The original notifier for Gmail.
Note from Mozilla: This add-on has been discontinued. Try Roomy Bookmarks Toolbar instead.
An extension that allows for the use of dynamic commands in Firefox.
A maintained version can be installed via: https://bitbucket.org/satyr/ubiquity/downloads/tip.xpi
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