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 greatest user script engine on the Internet (a fork of Greasemonkey).
Reclaims the browsing space by transforming Firefox 4's wide grey add-on bar into a neat set of buttons.
Fill in the rest of words as you type them into the location bar
Start loading pages as you select them from the location bar suggestions
Suggest words from the page when finding
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