Interface Customizations

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Linkification

Converts text links into genuine, clickable links...

Rated 4 out of 5 stars (274)
664 weekly downloads

FireTray

A system tray extension for linux, allowing to set up custom icon, hiding to tray instead of closing, display the number of unread messages in mailing applications, and other features ...

Rated 4 out of 5 stars (186)
657 weekly downloads

Safe for Amoled No Restart

Darkens the background of the page

Rated 4 out of 5 stars (12)
599 weekly downloads

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (4)
589 weekly downloads

Password Tags

Adds metadata and sortable tags to the password manager.

Rated 5 out of 5 stars (5)
578 weekly downloads

Right Links

This extension allows to open links in new tabs with right-click directly and using “long” left-click.
This is very useful for touchpads on notebooks and for mice without middle button.

Rated 5 out of 5 stars (88)
567 weekly downloads

Custom Buttons

Gives a possibility to create custom toolbarbuttons...

Rated 4 out of 5 stars (70)
524 weekly downloads

JSONovich No Restart

Pretty-prints JSON content in the browser for easy, unobtrusive viewing.

Rated 4 out of 5 stars (28)
522 weekly downloads

Fierr

Replaces the error page with a more stylish appearance with additional features.

Rated 5 out of 5 stars (44)
409 weekly downloads

Display Mail User Agent

Displays icon for user agent of received mails.

Rated 4 out of 5 stars (99)
390 weekly downloads

Duplicate This Tab

This add-on provides the much needed feature update of Tab Duplication to Mozilla Browsers. Features Supported include Duplication of Browser Tabs, Detaching Tabs and Merging All Windows.

Rated 4 out of 5 stars (35)
381 weekly downloads

ImageTweak: zoom/rotate images and videos!

A no-clutter image viewer for Firefox that allows you to zoom, rotate and display images/videos against a custom background. ImageTweak is a must-have addon for any photographer or photography-loving user.

Rated 4 out of 5 stars (88)
360 weekly downloads

CuteButtons - Crystal SVG

add icons to buttons/menus/anywhere (CuteMenus - Crystal SVG not required)

Rated 4 out of 5 stars (77)
337 weekly downloads

Old Default Image Style No Restart

Restores the default image style used for top-level images in previous versions of Firefox.

Rated 5 out of 5 stars (83)
302 weekly downloads

Big Navigation No Restart

Increases the navigation links on the pages

Rated 5 out of 5 stars (4)
297 weekly downloads

Compact Menu 2

Add a compact menu button to the navigation toolbar, and hide the menu bar.

Rated 4 out of 5 stars (318)
284 weekly downloads

HTML5 Loop

Loop HTML5 Video and Music.

Rated 5 out of 5 stars (1)
283 weekly downloads

Stylish-Custom

abandoned, use Stylish Custom Add-on instead
http://forum.userstyles.org/discussion/37939/stylish-custom-add-on/p1

custom additions to Stylish extension.
brings back features from 0.5.9 and adds new features

Rated 4 out of 5 stars (36)
283 weekly downloads

WebPG for Mozilla

An extension which provides GnuPG/GPG/PGP related functions to Moizilla Firefox, Thunderbird and Seamonkey

Rated 3 out of 5 stars (18)
262 weekly downloads

jQuery

jQuery and jQuery UI embedded in browser

Rated 5 out of 5 stars (5)
242 weekly downloads