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Greasemonkey Requires Restart

Customize the way a web page displays or behaves, by using small bits of JavaScript.

Rated 4 out of 5 stars (1,207)
884,871 users

Flashblock Requires Restart

Never be annoyed by a Flash animation again! Blocks Flash so it won't get in your way, but if you want to see it, just click on...

Rated 4 out of 5 stars (1,142)
286,171 users

EPUBReader Compatible with Firefox 57+ Featured

With EPUBReader you can read ePub files just in Firefox. No additional software needed!

Rated 4 out of 5 stars (215)
267,478 users

Garmin Communicator Requires Restart

The Garmin Communicator is an internet browser plugin that allows you to easily transfer data between websites and Garmin GPS devices.

Rated 2 out of 5 stars (41)
259,425 users

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 (488)
239,306 users

Hoxx VPN Proxy

Hoxx VPN Proxy service to unblock blocked websites, hide your location and encrypt your connection. Completely free.

Rated 5 out of 5 stars (3,332)
211,542 users

Add-ons Manager Context Menu Requires Restart

Add more items to Add-ons Manager context menu.

Rated 5 out of 5 stars (41)
134,062 users

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 (245)
83,026 users

Add-on Compatibility Reporter

Help make Firefox better. The Add-on Compatibility Reporter enables you to report if the Firefox add-ons that you're using are working properly (legacy add-ons only).

Rated 4 out of 5 stars (192)
65,875 users

Translate This!

Translate the whole entire page or just a selection using Google Translate.

Rated 3 out of 5 stars (103)
65,419 users

Save as PDF Requires Restart

Lets you download web pages as PDF in one click.

Rated 2 out of 5 stars (140)
62,774 users

Tampermonkey Compatible with Firefox 57+

Tampermonkey is the world's most popular userscript manager.

Rated 4 out of 5 stars (129)
62,650 users

LeechBlock Requires Restart

LeechBlock is a simple productivity tool designed to block those time-wasting sites that can suck the life out of your working day. All you need to do is specify which sites to block and when to block them.

Rated 5 out of 5 stars (690)
49,499 users

Low Quality Flash Requires Restart

Sets Flash objects to "Low Quality" to improve performance on slower platforms (i.e. older computers, netbooks, and Firefox Mobile).

Rated 4 out of 5 stars (44)
44,363 users

Disable Add-on Compatibility Checks

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

Rated 4 out of 5 stars (114)
38,175 users

PDF Mage Compatible with Firefox 57+

Save any page as PDF

Rated 4 out of 5 stars (77)
32,478 users

Selenium IDE Button Requires Restart

Just one simple toolbar button to open Selenium IDE. You need to have installed Selenium IDE: http://seleniumhq.org/projects/ide/

Rated 5 out of 5 stars (9)
31,865 users

Copy Plain Text 2 Requires Restart

Copies text without formatting

Rated 5 out of 5 stars (85)
31,329 users

Secure Login Requires Restart

Secure Login is an extension for Firefox integrated password manager.

For Firefox > 51, try my WebExtension implementation: https://addons.mozilla.org/en-US/firefox/addon/secure-login-webextension/

Rated 4 out of 5 stars (359)
27,571 users