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Menu Wizard Requires Restart

Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (251)
233 users

Yandex-EN

Search Yandex.com in English

Rated 5 out of 5 stars (7)
666 weekly downloads

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.

Rated 4 out of 5 stars (27)
663 weekly downloads

GoogleMaps

Google Maps Search

Rated 5 out of 5 stars (24)
641 weekly downloads

Searx.me - A Private Search Engine

A privacy-respecting, hackable metasearch engine.

Rated 5 out of 5 stars (3)
638 weekly downloads

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.

Rated 5 out of 5 stars (437)
70 users

Yahoo! Search for Firefox for Android

Yahoo! Search for Firefox on Android

Adds Yahoo! Search to the list of built-in search engines

Rated 4 out of 5 stars (8)
620 weekly downloads

Diccionario español Argentina

Spanish dictionary for Argentina.

Rated 4 out of 5 stars (93)
12,505 users

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".

Rated 3 out of 5 stars (413)
1,996 users

Ukrainian dictionary

Ukrainian (uk-UA) spellchecking dictionary

Rated 5 out of 5 stars (58)
9,770 users

Google Encrypted

Encrypted google.com search

Rated 5 out of 5 stars (27)
559 weekly downloads

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.

Rated 5 out of 5 stars (16)
558 weekly downloads

General Catalan dictionary

Free Catalan (general version) spelling dictionary.

Rated 4 out of 5 stars (40)
11,018 users

Metal Lion Sea Monkey Requires Restart

Metal Lion meets SeaMonkey.

Rated 5 out of 5 stars (10)
134 users

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.

Rated 4 out of 5 stars (82)
8,697 users

Unofficial Qwant Lite

The purpose of the site http://lite.qwant.com (hereafter “the Website”) is to provide a light version of the Qwant Search Engine (https://qwant.com). This version is compatible with the previous versions of Windows Internet Explorer 9.

Rated 5 out of 5 stars (6)
479 weekly downloads

German Dictionary, classical spelling standards

German Dictionary according to the classical spelling standards for spell-checking in Firefox and Thunderbird

Rated 5 out of 5 stars (20)
8,737 users

Torrent

Search for Torrents across all the major Torrent Trackers and Torrent Directories.
Torrent is a simple interface to the IPduh Torrent Search

Rated 4 out of 5 stars (8)
424 weekly downloads

Russian Hunspell dictionary

Создан на основе словаря Лебедева. Файл аффиксов постепенно переписывается, словарь ежедневно пополняется. Релиз выкладывается один раз в месяц первого числа.

Rated 3 out of 5 stars (65)
10,169 users

Easiest YouTube Video Downloader

This Addon simply adds a dropdown button that lets you download YouTube Videos in various Formats. Download YouTube Videos in FLV, 3GP, MP3, MP4, 720p, 1080p in a single click.

Rated 3 out of 5 stars (47)
138 users