Up & Coming Extensions

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Disable Add-on Compatibility Checks (Version 40+)

Reinstates the extensions.checkCompatibility preference.

Rated 5 out of 5 stars (2)
13,982 users

XDM Hook Requires Restart

XDM integration module for Firefox

Not yet rated
1,218 users

TabSubmit

Lets the user direct the submission of a form to a new tab or window. [Bug #17754]

Rated 5 out of 5 stars (14)
5,579 users

RefControl Requires Restart

Control what gets sent as the HTTP Referer on a per-site basis.

Rated 4 out of 5 stars (186)
94,507 users

Page Colors & Fonts Buttons

Adds buttons to toggle the using the default page colors and fonts, and the page defined colors and fonts.

Rated 4 out of 5 stars (4)
1,790 users

Proxy Tool Requires Restart

Proxy Tool - Powerful, yet User-friendly proxy tool to manage your proxies and anonymity needs, including: 46M+ user agents (world's largest), 10 different spoofed HTTP referrers, auto-proxy rotation, plus many more. Developed by http://ProxyList.co

Rated 4 out of 5 stars (40)
115,772 users

PlayFlash 32bit Requires Restart

Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.

Rated 5 out of 5 stars (10)
4,709 users

uBlock Origin

Finally, an efficient blocker. Easy on CPU and memory.

Rated 5 out of 5 stars (768)
2,574,643 users

Remote XUL Manager

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Rated 5 out of 5 stars (36)
86,716 users

Join-NG Requires Restart

Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".

Rated 5 out of 5 stars (4)
3,025 users

Google Hangouts Web Messenger

Google Hangouts Web Messenger brings Google Hangouts right into your browser to chat with your friends.

Rated 5 out of 5 stars (2)
2,592 users

LookOut (fix version) Requires Restart

LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
Support: Thunderbird and SeaMonkey

Rated 5 out of 5 stars (4)
15,459 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 (25)
3,828 users

Decentraleyes

Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.

Rated 5 out of 5 stars (79)
58,667 users

Gmail Manager-community Requires Restart

Manage multiple Gmail accounts and receive new mail notifications.

Rated 4 out of 5 stars (29)
1,505 users

about:addons-memory 2016

Adds a new page that shows add-on memory usage

Rated 5 out of 5 stars (22)
10,620 users

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 (183)
67,940 users

Disable Add-on Compatibility Checks

Reinstates the extensions.checkCompatibility preference without respect to the current application version.

Rated 4 out of 5 stars (107)
41,827 users

Simple YouTube MP3 Button

Adds a small and simple button to YouTube videos that allows you to quickly download the audio of the video as an MP3 file (quality of the MP3 is as high as the video offers) without having to leave the page.

Rated 5 out of 5 stars (28)
27,189 users

Add-ons Manager Context Menu Requires Restart

Add more items to Add-ons Manager context menu.

Rated 5 out of 5 stars (37)
73,041 users