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ProfileSwitcher

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

Rated 4 out of 5 stars (61)
41,761 users

Web2PDF Converter Featured

Web page to PDF conversion tool

Rated 4 out of 5 stars (87)
40,192 users

Minimize On Start and Close

A remake of the MinimizeToTray-extension made to fit the Windows 7 taskbar. Instead of minimize the window to the tray it minimize it to the taskbar. It can minimize on startup, when the window is closed and/or when the esc key is pressed.

Rated 4 out of 5 stars (94)
38,614 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 (92)
38,482 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 (126)
38,262 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (189)
36,520 users

Copy Plain Text 2 Featured

Copies text without formatting

Rated 5 out of 5 stars (58)
35,059 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)
32,510 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)
31,331 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)
29,518 users

Memory Restart

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

Rated 4 out of 5 stars (122)
27,328 users

Free Memory No Restart Featured

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

Rated 4 out of 5 stars (47)
26,917 users

Copy As Plain Text Featured

Removes formatting from copied text.

Rated 4 out of 5 stars (55)
24,958 users

QuickNote

A simple note-taking extension.

Rated 5 out of 5 stars (168)
24,920 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)
24,655 users

AutoCopy

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

Rated 4 out of 5 stars (521)
22,057 users

Fox!Box

Assign the FRITZ!Box to reconnect.

Rated 4 out of 5 stars (128)
21,443 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)
21,253 users

Integrated Google Calendar

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

Rated 5 out of 5 stars (60)
20,518 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 (131)
19,719 users