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Greasemonkey

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

Rated 4 out of 5 stars (856)
1,801,849 users

Flashblock

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 (869)
990,290 users

EPUBReader Featured

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

Rated 5 out of 5 stars (130)
446,032 users

Garmin Communicator

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

Rated 3 out of 5 stars (18)
289,904 users

Session Manager No Restart Featured

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 (420)
252,357 users

PDF Viewer No Restart

PDF.js brings Portable Document Format (PDF) reading capabilities to your browser using web standard technologies.

Please report issues to: https://github.com/mozilla/pdf.js/issues

Rated 4 out of 5 stars (212)
178,943 users

Memory Fox

Attempting to reduce both Browser and Flash RAM Memory usage. Memory Fox will promote the increase of available RAM memories for other application processes. Hopefully, fostering any attempts of Memory Recovery and Retention.

Rated 4 out of 5 stars (257)
158,721 users

Add-on Compatibility Reporter No Restart

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.

Rated 4 out of 5 stars (193)
128,011 users

YouTube Center No Restart

YouTube Center contains all kind of different useful functions which makes your visit on YouTube much more entertaining.

Rated 4 out of 5 stars (160)
122,193 users

wmlbrowser

Simulate WAP browsing by viewing WML (Wireless Markup Language) pages.

Rated 4 out of 5 stars (26)
120,006 users

Low Quality Flash

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 (39)
90,941 users

UnMHT No Restart

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 5 out of 5 stars (182)
84,891 users

LeechBlock Featured

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 (396)
74,751 users

Translate This! No Restart

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

Rated 4 out of 5 stars (59)
67,851 users

Secure Login Featured

Secure Login is an extension for Firefox integrated password manager.

Rated 4 out of 5 stars (277)
67,027 users

Mozilla Firefox hotfix No Restart

This official add-on enables Firefox to provide quick fixes for selected issues.

Not yet rated
66,389 users

Save as PDF

Lets you download web pages as PDF in one click.

Rated 3 out of 5 stars (82)
65,102 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (182)
57,982 users

Disable Add-on Compatibility Checks No Restart

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

Rated 4 out of 5 stars (82)
46,781 users

Image Block Featured

Image Block adds a toggle button that conditionally blocks/allows loading of images on webpages. Blocking images results in faster browsing, especially helpful on handheld devices or slower connections like GSM/GPRS/EDGE dial-up etc.

Rated 4 out of 5 stars (99)
44,177 users