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Cookie Importer
Requires Restart
Imports cookies from a textfile.
Reads Netscape standard cookies.txt files as exported by IE and others.
Very useful in combination with the Cookie Exporter add-on.
Simple Locale Switcher
Requires Restart
An easier management of the user interface language
Yandex-EN
Startpage (SSL)
Startpage is a search engine that does not collect or share personally identifiable information. This search bar add-on utilizes SSL to protect searches between You and Startpage.
Theme Font & Size Changer for ThunderBird
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
GoogleMaps
Searx.me - A Private Search Engine
A privacy-respecting, hackable metasearch engine.
Download Status Bar
If you are the kind of person who likes to have total control over every aspect of your downloads, "Download Status Bar" is the add-on you are looking for.
Yahoo! Search for Firefox for Android
Yahoo! Search for Firefox on Android
Adds Yahoo! Search to the list of built-in search engines
Diccionario español Argentina
British English Dictionary
British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.
To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".
Mozilla Archive Format, with MHT and Faithful Save
Requires Restart
— Open web pages saved with Internet Explorer or other browsers (MHT)
— Save many tabs, video and audio reliably, in a single ZIP file (MAFF)
— Return to the original site you saved a page from, and more!
Ukrainian dictionary
Google Encrypted
Duck Duck Go (SSL)
Duck Duck Go is a search engine that does not collect or share personally identifiable information. This search bar add-on utilizes SSL to protect searches between You and Duck Duck Go.
General Catalan dictionary
AutoProxy
Requires Restart
Are you concerned about your privacy? Or, are you blocked from some websites by a firewall? And, are you arming yourself with a proxy? In that case, AutoProxy is designed for you! A tool to help you use your proxy automatically & efficiently.
Metal Lion Sea Monkey
JavaScript Debugger
Requires Restart
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.
Canadian English Dictionary
For some reason, Mozilla doesn't have a Canadian localization team, but I know that even the British dictionary doesn't quite cut it for the truly patriotic.
To create your own collections, you must have a Mozilla Add-ons account.
