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MR Tech Toolkit Requires Restart

(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)
25,115 users

JSONovich

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

Rated 4 out of 5 stars (38)
7,553 users

Reading List Requires Restart

Save pages for reading offline

Rated 5 out of 5 stars (5)
10 users

Yoolki Arabic Keyboard Requires Restart

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

Rated 5 out of 5 stars (10)
147 users

Mobile Tools Requires Restart

Tools for working with web pages in Firefox Mobile

Rated 5 out of 5 stars (8)
20 users

Extension Test Requires Restart

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)
133 users

AntiGameOrigin v6

AntiGameOrigin - the other OGame experience for all communities.

Rated 5 out of 5 stars (4)
11,743 users

No More Install Delay

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)
632 users

Google Reader New Style Minimalistic By DemianGod

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)
142 users

URL Fixer Featured

URL Fixer fixes common typos in URLs entered in the address bar. It will fix errors like "google.con" or "youtube,com". You have the option of being asked to confirm corrections before they are applied.

Rated 4 out of 5 stars (106)
11,039 users

DOM Inspector Plus! [dm] Requires Restart

Improved DOM Inspector! [dm version]. Box Model new layout & more data, see screenshot!. Horizontal scroll for Dom-Tree, and some more.
Inspects the structure and properties of a window and its contents.

Rated 5 out of 5 stars (5)
498 users

Jureeka! Powered by LII. Requires Restart

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)
100 users

Copy As Plain Text Requires Restart

Removes formatting from copied text.

Rated 4 out of 5 stars (59)
17,936 users

Near Me Requires Restart

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 Requires Restart

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 Requires Restart

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)
7 users

South African English spell checker Requires Restart

The South African English spell checker allows you to use place names, borrowed words, and other expressions that are unique to South Africa.

"No more eina, just a lekker spell checker!"

Rated 5 out of 5 stars (3)
1,605 users

URL Fixer Plus RU and UA Requires Restart

Extended URL Fixer for RU and UA

Rated 4 out of 5 stars (21)
59,851 users

Fastest Scroll In The West Requires Restart

Scroll quickly the page. For navigation in long or large pages.

This extension is one of the Firefox Mobile Add-on Challenge Winners!

Rated 5 out of 5 stars (4)
2 users

Xultris Requires Restart

Xultris is a variant of the computer game classic Tetris.

Rated 4 out of 5 stars (17)
1,173 users