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Complete YouTube Saver Requires Restart

Download YouTube videos in various formats including 1080p, 4K etc (DASH formats). Convert audio track from videos to MP3 or WAV, or save audio in native format (Ogg, AAC/M4A, MP3, OPUS). Save YouTube page, video, comments and subtitles to one folder

Rated 4 out of 5 stars (185)
110 users

ChatZilla Requires Restart

A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.

Rated 4 out of 5 stars (151)
13,426 users

Toolbar Buttons

Adds toolbar buttons to the customize toolbar window in several programs including Firefox, Thunderbird and SeaMonkey. Some of the buttons make commonly preformed actions quicker, others add new functionality.

Rated 4 out of 5 stars (372)
299 users

Dorando keyconfig Requires Restart

A modified Dorando's addon to rebind keyboard shortcuts. It is designed to be a drop-in replacement, keeping your old settings. (See details for upgrade instructions.)

As of version 2016.2, Custom keys (using custom JavaScript) work again!

Rated 5 out of 5 stars (66)
236 users

Arabic spell-checking dictionary

Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.

Rated 4 out of 5 stars (43)
653 users

United States English Spellchecker

This dictionary is no longer maintained. Use this dictionary instead.

Rated 4 out of 5 stars (207)
4,601 users

DuckDuckGo on TOR

Search with DuckDuckGo using the TOR network without JavaScript

Rated 5 out of 5 stars (10)
226 weekly downloads

Facebook Search

Facebook Search without logging in! Search Facebook Messages, People, Applications, Music, Video, Groups etc. For more it allows one to search for specific texts on the walls of Facebook subscribers en masse. Make your keyword search around Facebook!

Rated 5 out of 5 stars (2)
224 weekly downloads

The Pirate Bay (SSL)

The Pirate Bay is a popular BitTorrent index. This search bar add-on utilizes SSL to protect searches between You and The Pirate Bay.

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

iDope TORRENT

iDope is a torrent search engine with over 16,530,350 torrents on the site. The https://idope.se site is Ad-free, clean and safe. There was also an APP for Android.

Rated 5 out of 5 stars (13)
223 weekly downloads

Google (UK)

Google.co.uk search with no shenanigans

Rated 5 out of 5 stars (15)
221 weekly downloads

Proxy Privacy Ruler

Restrict Proxy by Private Windows, Tabs and Domain List

Rated 5 out of 5 stars (31)
22 users

P7MON Requires Restart

Abilita la gestione alternativa degli allegati P7M

Rated 5 out of 5 stars (3)
90 users

Google Images

Google Images Search

Rated 4 out of 5 stars (53)
216 weekly downloads

Filmweb

Filmweb.pl - Head full movies. Filmweb.pl Search engine for Firefox.

Rated 3 out of 5 stars (4)
210 weekly downloads

SocialBlade Youtube

Social Blade Youtube - Desenvolvimento do add-on: EduRebecca

Rated 2 out of 5 stars (4)
208 weekly downloads

Wolfram|Alpha

Search the brand new Wolfram|Alpha computational search engine.

Rated 5 out of 5 stars (14)
205 weekly downloads

Brazilian Portuguese Dictionary (Former Spelling)

The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (which is valid until January 1st 2016).

Rated 4 out of 5 stars (6)
684 users

GenScript Search

This is an officially supported GenScript Search Add-on, provided by GenScript. The GenScript Search Add-on can enable you get access to comprehensive biology services, products, and useful bioinformatics tools much more easily and conveniently.

Rated 4 out of 5 stars (1)
199 weekly downloads

Romanian spellchecking dictionary

Romanian spellchecking dictionary for Firefox.

Rated 4 out of 5 stars (40)
4,101 users