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Proxy Selector

Proxy Selector lets you switch local proxies in Firefox.

Rated 4 out of 5 stars (104)
41,417 users

ProfileSwitcher

It adds some options to launch easily other profiles and the Profile Manager.

Rated 4 out of 5 stars (58)
39,183 users

Web2PDF Converter Featured

Web page to PDF conversion tool

Rated 4 out of 5 stars (87)
39,150 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 (91)
38,642 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (189)
37,497 users

Customizable Shortcuts No Restart

Allows to customize or disable most of the shortcuts offered by Firefox. This add-on does *not* allow to add new shortcuts, but it might help you discover existing ones.

Rated 4 out of 5 stars (117)
37,177 users

Copy Plain Text 2 Featured

Copies text without formatting

Rated 5 out of 5 stars (57)
34,266 users

Show My Password Featured

You are annoyed because your password fields are always scrambled though nobody else but you can see the screen? This most advanced unscrambling addon shows your passwords in readable letters, while being fully customizable to fit your needs.

Rated 5 out of 5 stars (72)
31,987 users

PrintPDF

This allows users on Windows and Linux to print web pages to PDF. Mac users you already have this functionality.

Rated 3 out of 5 stars (179)
30,140 users

Selenium IDE Button

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 (8)
29,067 users

Memory Restart

Gives you a quick way to restart if memory usage is too high.

Rated 4 out of 5 stars (122)
26,455 users

Free Memory No Restart Featured

An add-on to perform free-memory operations without visiting about:memory.

Rated 4 out of 5 stars (43)
26,451 users

Save Text To File No Restart Featured

Saves highlighted text to a file in the specified directory

Rated 5 out of 5 stars (89)
25,441 users

QuickNote

A simple note-taking extension.

Rated 5 out of 5 stars (167)
24,514 users

Copy As Plain Text Featured

Removes formatting from copied text.

Rated 4 out of 5 stars (54)
23,312 users

AutoCopy

Select text and it's automatically copied to the clipboard. Also pastes on middle click.

Rated 4 out of 5 stars (521)
22,332 users

Fox!Box

Assign the FRITZ!Box to reconnect.

Rated 4 out of 5 stars (128)
22,300 users

Grab and Drag

Enables Adobe Acrobat-style grab and drag scrolling, Flick gestures, and Momentum scrolling in Firefox. Useful for (older) pen or touchscreen-based devices for which these gestures are not natively supported. Not useful on Windows 8 touch devices.

Rated 4 out of 5 stars (254)
20,726 users

Integrated Google Calendar

Integrate your Google Calendar with Firefox in a simple way.
No need extra login!!

Rated 5 out of 5 stars (61)
20,008 users

RAMBack

RAMBack will cause Firefox to issue an internal notification to free up memory that is otherwise held for performance purposes. Additional items will be hooked into this notification in the future.

Rated 3 out of 5 stars (129)
19,027 users