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 easy way to download and convert Web videos from hundreds of YouTube-like sites.
Adblock Plus Pop-up Addon extends the blocking functionality of Adblock Plus to those annoying pop-up windows that open on mouse clicks and other user actions.
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.
19,182 weekly downloads
This add-on will add an improved version of YouTube's search engine, now with search suggestions!
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The Web Developer extension adds various web developer tools to the browser.
Personas are free, easy-to-install "skins" for Firefox. Personas Plus extends that built-in functionality to give you even more control and easier access to new, popular, and your own favorite Personas.
Searches for marked words in the database at dict.leo.org and opens the result in a new tab. The fastest way to search at leo.org. It supports English, French, Spanish, Chinese, Italian and Russian to German translation.
Help make Firefox better. The Add-on Compatibility Reporter enables you to report if the Firefox add-ons that you're using are working properly.
463 weekly downloads
Deutsche Wikipedia Suchmachine
Stop searching at PHP.net to simply remember some function signature. With this addon you can search functions quickly for the official function description directly into your browser without a new tab.
Plus, many tools to help PHP developers.
Collections are groups of related add-ons that anyone can create and share.Explore Collections