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.
TryAgain keeps trying to load a webpage when the server cannot be reached.
Protects against Blackhat spam SEO in search engines (Google, Bing & Yahoo).
Big Navigation No Restart
enlarging the navigation links on the pages
(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...
JSONovich No Restart
Pretty-prints JSON content in the browser for easy, unobtrusive viewing.
Save pages for reading offline
Write arabic text "bil 3arabi" on any web page without the need for an Arabic Keyboard.
Tools for working with web pages in Firefox Mobile
A simple add-on for extension testers, especially AMO editors and developers who plan to submit their add-ons to AMO.
AntiGameOrigin v6 No Restart
AntiGameOrigin - the other OGame experience for all communities.
Extended URL Fixer for RU and UA
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.
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
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.
Removes formatting from copied text.
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.
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! **
Open a hyperlink in a new tab by pressing and holding a link.