Bra skit. Plus denna: http://www.pikey.me.uk/mozilla/extensions/clonewindow.xpi
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).
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.
The Web Developer extension adds various web developer tools to the browser.
IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...
YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
http://yslow.org is the official open source website.
With gtranslate you can translate any text in a web page just by selecting and right-clicking over it. The extension uses the Google translation services to translate the text.
Integrates location bar and search bar into one. Shows search and url suggestions. Quickly switch search engine using search keywords. Provides different auto-complete popup styles for compact displays.
Allows you to hide almost anything via context menu 'Remove Object'.
Add a compact menu button to the navigation toolbar, and hide the menu bar.
Server Spy indicates what brand of HTTP server (e.g. Apache, IIS, etc.) runs on the visited sites.
Collections are groups of related add-ons that anyone can create and share.Explore Collections