Extensions by Weekly Downloads

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Provider for Google Calendar Requires Restart

Allows bidirectional access to Google Calendar

Rated 4 out of 5 stars (953)
9,639 weekly downloads

Speed Dial Requires Restart

Direct access to your most visited websites

Rated 4 out of 5 stars (1,255)
9,581 weekly downloads

SQLite Manager Requires Restart

Manage any SQLite database on your computer.

Rated 4 out of 5 stars (84)
9,322 weekly downloads

µBlock

The most efficient blocker for Firefox.

No ads, no tracking, and insanely faster page loads.

Rated 4 out of 5 stars (243)
8,510 weekly downloads

Session Manager

Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.

Rated 4 out of 5 stars (519)
8,456 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 (288)
8,133 weekly downloads

adaware ad block

By blocking annoying ads and nosy trackers, adaware ad block nearly doubles your browsing speed! And with the most robust antivirus-level cloud-scanning technology of any ad blocker on the market, you’ll be safe from the latest cyber-threats.

Rated 4 out of 5 stars (70)
8,113 weekly downloads

Enigmail Requires Restart Featured

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

Rated 4 out of 5 stars (197)
7,897 weekly downloads

Personas Plus

Personas (now known as lightweight themes) are free, easy-to-install "skins" for Firefox. Personas Plus extends that built-in functionality to give you even more control and easier access to new, popular, and your own favorite themes.

Rated 3 out of 5 stars (859)
6,814 weekly downloads

Theme Font & Size Changer

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.

Rated 5 out of 5 stars (188)
6,242 weekly downloads

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.

Rated 4 out of 5 stars (387)
5,761 weekly downloads

Live HTTP Headers Requires Restart

View HTTP headers of a page and while browsing.

Rated 4 out of 5 stars (180)
5,266 weekly downloads

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!

Rated 5 out of 5 stars (286)
4,987 weekly downloads

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 (248)
4,503 weekly downloads

QuickNote Requires Restart

A simple note-taking extension.

Rated 5 out of 5 stars (175)
4,260 weekly downloads

Torrent Tornado Requires Restart

A Torrent Client for Firefox and SeaMonkey, runs everywhere, created in pure JavaScript without binary software!

Rated 4 out of 5 stars (107)
4,259 weekly downloads

UnMHT

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

Rated 4 out of 5 stars (250)
3,927 weekly downloads

VKontakte.ru Downloader (music/videos/photos @ VK) Requires Restart

Download music, videos and photos from VK.com / vkontakte.ru. One-click download, natural filenames, displaying file size and bitrate for music, downloading HD video, downloading HQ photos. No spam, no usage of your account, no spyware.

Rated 4 out of 5 stars (499)
3,714 weekly downloads

gContactSync Requires Restart

Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.

Rated 4 out of 5 stars (224)
3,521 weekly downloads

Fire IE (FireIE, Enhanced IE) Requires Restart

Embeds Internet Explorer(IE) to use the powerful Firefox add-ons.
Not only an enhanced IE Tab, but also an enhanced Internet Explorer with Adblock Plus and FireGestures support.
Switch to the IE engine in one click and dismiss your IE.

Rated 4 out of 5 stars (201)
3,240 weekly downloads