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Proxy Selector

Proxy Selector lets you switch local proxies in Firefox.

Rated 4 out of 5 stars (104)
41,824 users

Web2PDF Converter Featured

Web page to PDF conversion tool

Rated 4 out of 5 stars (87)
39,557 users

ProfileSwitcher

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

Rated 4 out of 5 stars (58)
39,320 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)
38,762 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (189)
37,704 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 (118)
37,038 users

Copy Plain Text 2 Featured

Copies text without formatting

Rated 5 out of 5 stars (57)
34,385 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 (71)
32,225 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)
30,429 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)
29,172 users

Memory Restart

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

Rated 4 out of 5 stars (122)
26,640 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)
26,602 users

Save Text To File No Restart Featured

Saves highlighted text to a file in the specified directory

Rated 5 out of 5 stars (90)
25,432 users

QuickNote

A simple note-taking extension.

Rated 5 out of 5 stars (167)
24,517 users

Copy As Plain Text Featured

Removes formatting from copied text.

Rated 4 out of 5 stars (54)
23,459 users

Fox!Box

Assign the FRITZ!Box to reconnect.

Rated 4 out of 5 stars (128)
22,529 users

AutoCopy

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

Rated 4 out of 5 stars (521)
22,386 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)
20,755 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)
20,136 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)
19,048 users