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).
Never be annoyed by a Flash animation again! Blocks Flash so it won't get in your way, but if you want to see it, just click on...
Use PDF Download to do whatever you like with PDF files on the Web. Regain control and eliminate browser problems, view PDFs directly in Firefox as HTML, and use the all-new Web-to-PDF toolbar to save and share Web pages as high-quality PDF files.
A light-weight Google search toolbar for Firefox. Offers 14 search types, Google search suggestions (in 5.0+), search history auto-completion, a customizable toolbar, search word highlighting, and more.
Useful tools for the nightly tester.
Toggles dictionaries automatically or manually and displays the currently selected one
Select text and it's automatically copied to the clipboard. Also pastes on middle click.
Supports to hide Menu Bar automatically, you can press the ALT key to show it temporarily.
CoLT (short for "Copy Link Text") makes it easy to copy either a link's text, or both the link text and its URL in a format you specify. This non-invasive extension simply appears as context menu items when you right-click a link. Fully customizable!
Type web addresses always in Latin letters no matter of your current keyboard layout.
Collections are groups of related add-ons that anyone can create and share.Explore Collections