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YSlow

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.

Rated 3 out of 5 stars (164)
149,283 users

gTranslate Featured

With gTranslate you can translate any text in a webpage just by selecting and right-clicking over it. The extension uses the Google translation services to translate the text.

Rated 4 out of 5 stars (377)
147,110 users

Toolbar Buttons

A button pack for Firefox, Thunderbird and Sunbird

Rated 4 out of 5 stars (299)
147,108 users

Stealthy

Does your country/organization block you from facebook, youtube or others?
Is the service you want unavailable in your country?
Stealthy is the solution for you.
Unlike other extensions we do the work of look for fast proxies for you.

Rated 3 out of 5 stars (89)
146,214 users

Youtube Downloader - Media Downloader

Download from YouTube and thousands other video websites. Share and tag videos using Clickberry!

Rated 3 out of 5 stars (8)
146,017 users

SearchPreview

The extension previously known as GooglePreview. Inserts preview images (thumbnails) and popularity ranks of web sites into the Google, Yahoo, Bing and DuckDuckGo search results pages.

Rated 4 out of 5 stars (352)
145,643 users

Self-Destructing Cookies No Restart Featured

Cookies when you need them, not when others need them to track you - gets rid of a site's cookies and LocalStorage as soon as you close its tabs. Protects against trackers and zombie-cookies. Trustworthy services can be whitelisted.

Rated 4 out of 5 stars (228)
144,614 users

ALLYouTubeDownloader

ALLYouTubeDownloader extention (FLV/MP4/WebM; HD/HQ). Windows only. Works only with ALL YouTube Downloader 2.3 application or higher (versions 2.2 and lower doesn't work anymore).
Homepage: http://www.allplayer.org/youtube-to-allplayer

Rated 3 out of 5 stars (7)
142,753 users

Thumbnail Zoom Plus Featured

Shows full image when you hover over a thumbnail. Works with Amazon, Baidu Images, Bing Images, Facebook, Flickr, Google+, Google Images, IMDb, LinkedIn, Netflix, Pinterest, Reddit, Twitter, Yandex, YouTube, Wikipedia, Yahoo Images, & many more.

Rated 5 out of 5 stars (203)
142,585 users

Download Manager Tweak

Allows the download manager to also open in a tab or sidebar, and adds some optional display changes.

Rated 4 out of 5 stars (344)
140,453 users

Tamper Data

Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...

Rated 4 out of 5 stars (112)
139,941 users

MR Tech Toolkit

(Formerly Local Install) The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally and tons of other features.

Note: With Toolkit 6.0 Auto Archiving is fully working in Firefox 2.0 and temp...

Rated 4 out of 5 stars (133)
138,219 users

All-in-One Gestures Featured

This extension allows you to execute common commands using mouse gestures, rocker navigation, scroll wheel navigation and page...

Rated 4 out of 5 stars (373)
137,532 users

Similar Sites - Find The Best Related Websites

Instant access to the best websites related to the site you are browsing!

Rated 5 out of 5 stars (16)
135,801 users

Bitdefender QuickScan

The quickest way to find out if your computer is infected!
Bitdefender QuickScan is a very fast antivirus scanner, able to determine in a matter of seconds if a system is infected with malware.
More on http://quickscan.bitdefender.com/faq

Rated 4 out of 5 stars (50)
135,771 users

Add-on Compatibility Reporter No Restart

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.

Rated 4 out of 5 stars (194)
135,528 users

Print pages to Pdf Featured

Creates one Pdf from any amount of open Browsertabs,Bookmarks/-folder, Scrapbook(Plus) pages. This document can be archived, sended by e-mail or printed out with any standard Pdf Viewer.

Rated 5 out of 5 stars (179)
134,529 users

RequestPolicy Featured

Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.

Rated 4 out of 5 stars (169)
132,526 users

Youtube and more – Easy Video Downloader No Restart

Download and save videos playing on a website like youtube to your hard disk

Rated 4 out of 5 stars (233)
131,531 users

AutoPager

AutoPager automatically loads next pages when you reach the end of a page. It works on a ton of sites,Google,Yahoo..
It works well with most other add-ons adblock plus, WOT and most of the greasemonkey scripts.
You can also try AutoPagerLite.

Rated 5 out of 5 stars (353)
128,670 users