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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)
11,217 users

Metal Lion Sea Monkey Requires Restart

Metal Lion meets SeaMonkey.

Rated 5 out of 5 stars (10)
135 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)
8,855 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)
8,968 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)
9,410 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)
140 users

Hungarian Dictionary

This extension is based on László Németh's Hungarian Dictionary

Rated 4 out of 5 stars (56)
7,947 users

Youtube MP3 Podcaster Requires Restart

Self contained add-on for downloading youtube videos to mp3 for easy listening on podcasting gadgets like a Zune or iPod

Rated 4 out of 5 stars (275)
5 users

Makepolo Search

Accurate purchasing search engine. http://en.makepolo.com/

Rated 4 out of 5 stars (4)
375 weekly downloads

Český slovník pro kontrolu pravopisu

Slovník pro kontrolu pravopisu pro aplikace Mozilla

Rated 4 out of 5 stars (36)
13,148 users

German Dictionary, extended for Austria

German dictionary (new Orthography) for spellchecking in Mozilla products, extended with Austrian words

Rated 5 out of 5 stars (22)
4,988 users

hongxing cross the wall search

hongxing search cross the wall .
hongxing browse ,the extension on mozilla : https://addons.mozilla.org/zh-CN/firefox/addon/247541/
the others IE ,chrome ,safari ,opera extensions is here: http://fwall-w.appspot.com

Rated 3 out of 5 stars (11)
350 weekly downloads

GNotifier

Add-on for Thunderbird that replaces the built-in notifications with OS native ones. It supports most Linux Desktop Environments as well as Windows 8.1/10.

Rated 5 out of 5 stars (48)
13 users

German Dictionary (Switzerland)

Dictionary with Swiss variants of German words for spellchecking in Mozilla products

Rated 5 out of 5 stars (3)
12,963 users

Stylish Sync

Sync engine for Stylish with backup / restore facility.

Rated 5 out of 5 stars (31)
4 users

Swedish Dictionary

Swedish spell-check dictionary.

Rated 5 out of 5 stars (22)
6,184 users

Google.de

Google Deutschland

Rated 3 out of 5 stars (13)
296 weekly downloads