Top-Rated Extensions

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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 4 out of 5 stars (407)
43,893 users

TryAgain

TryAgain keeps trying to load a webpage when the server cannot be reached.

Rated 4 out of 5 stars (64)
7,743 users

Search Engine Security

Protects against Blackhat spam SEO in search engines (Google, Bing & Yahoo).

Rated 5 out of 5 stars (10)
3,548 users

Big Navigation No Restart

enlarging the navigation links on the pages

Rated 5 out of 5 stars (6)
825 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 (143)
35,591 users

Reading List

Save pages for reading offline

Rated 5 out of 5 stars (5)
14 users

Yoolki Arabic Keyboard

Write arabic text "bil 3arabi" on any web page without the need for an Arabic Keyboard.

Rated 5 out of 5 stars (10)
196 users

Mobile Tools

Tools for working with web pages in Firefox Mobile

Rated 5 out of 5 stars (8)
39 users

Extension Test

A simple add-on for extension testers, especially AMO editors and developers who plan to submit their add-ons to AMO.

Rated 5 out of 5 stars (6)
162 users

JSONovich No Restart

Pretty-prints JSON content in the browser for easy, unobtrusive viewing.

Rated 4 out of 5 stars (33)
9,742 users

URL Fixer Plus RU and UA

Extended URL Fixer for RU and UA

Rated 4 out of 5 stars (20)
63,912 users

Xultris

Xultris is a variant of the computer game classic Tetris.

Rated 4 out of 5 stars (15)
762 users

Copy As Plain Text

Removes formatting from copied text.

Rated 4 out of 5 stars (58)
22,503 users

No More Install Delay No Restart

UPDATE: XPI delay has been removed in Firefox 40!

Disable the install delay in Firefox. New 2.0 version now includes GreaseMonkey scripts!

Unlike similar addons, this works on Firefox 4 and beyond.

Rated 4 out of 5 stars (12)
785 users

Google Reader New Style Minimalistic By DemianGod No Restart

Removes all the junk from New Google Reader and just gives you the search and collapsable subscriptions + favicons. By DemianGod

Also you can install the Script for GreaseMonkey.
Download from: http://userscripts.org/scripts/show/30242

Rated 4 out of 5 stars (9)
189 users

Jureeka! Powered by LII.

Surf the legal web you didn't know was there!
Jureeka simplifies online legal research by transforming plain-text legal citations into direct links to the source material, now powered by the free law pioneers at the Legal Information Institute.

Rated 4 out of 5 stars (11)
118 users

NextPage for mobile No Restart

A button in the navigation toolbar,auto find and navigate to the next page for you.It works for all sites.

Rated 5 out of 5 stars (3)
463 users

Near Me

Easily find businesses around you quickly. This add-on uses the location supplied by Firefox to allow you to search for places around you.

** Winner of Mozilla Mobile Add-ons Challenge! **

Rated 5 out of 5 stars (3)
1 user

Hold4Tab

Open a hyperlink in a new tab by pressing and holding a link.

Rated 5 out of 5 stars (3)
1 user

Tamil to Sinhala Transliteration

Transliterate Tamil selected text in to Sinhalese. When click on that text full transliterated text display as popup.

Rated 5 out of 5 stars (3)
9 users