Interface Customizations

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Duplicate Tab Blocker No Restart

Prevent duplicate tabs. Allow only one tab for a url. If you click a link that is already opened in a tab, then existing tab would be focused instead of opening a new tab. This works even across firefox windows.

Rated 3 out of 5 stars (7)
1,032 users

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)
3,782 users

Lightweight Themes Manager No Restart

Manage your installed personas (lightweight themes).

Rated 5 out of 5 stars (3)
13,786 users

Linkification

Converts text links into genuine, clickable links...

Rated 4 out of 5 stars (274)
36,509 users

ThreadKey

Strike the 'T' key to sort messages by thread, strike the 'U' key to sort them unthreaded again, just like the 'G' key switches to Grouped By Sort view

Rated 4 out of 5 stars (21)
1,728 users

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)
3,558 users

Browser View

Open Firefox links, pages, and bookmarks in any other browsers.

Rated 4 out of 5 stars (35)
1,814 users

Browser View Plus (PlayLink)

Open Firefox links, pages, and bookmarks in any other browsers or media players.

Rated 5 out of 5 stars (10)
1,475 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (182)
55,319 users

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)
9,962 users

Firesizer

Allows you to resize the window to specific dimensions.

NOTE: Users of Firefox 29 and above must install "The Addon Bar" extension to use this, as Firesizer uses the add-on bar that has been removed in Firefox 29.

Rated 4 out of 5 stars (117)
42,047 users

Display Mail User Agent

Displays icon for user agent of received mails.

Rated 4 out of 5 stars (99)
40,893 users

HashColouredTabs+

Improves tab identification by providing a small colored icon for any site which doesn't have its own 'site icon'.
★ 'favicon' now also shown in history and bookmarks ★

Rated 4 out of 5 stars (38)
2,646 users

CuteButtons - Crystal SVG

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

Rated 4 out of 5 stars (77)
11,407 users

Custom Buttons

Gives a possibility to create custom toolbarbuttons...

Rated 4 out of 5 stars (70)
83,461 users

YouTube Anywhere Player No Restart

Watch videos anywhere in cinema mode without leaving the website you're on.

Rated 5 out of 5 stars (45)
38,939 users

Duplicate Tab

Duplicate Tab allows you to clone a tab along with its...

Rated 4 out of 5 stars (163)
1,670 users

Remember Mismatched Domains

The Remember Mismatched Domains extension for Firefox and Thunderbird adds a "Don't warn me again about this certificate for this domain" checkbox to the Domain Mismatch and Expired Certificate warning windows. When selected the domain...

Rated 5 out of 5 stars (66)
4,812 users

IE Tab + (FF 8+, 7, 6, 5, 4, 3.6, 3.5, SeaMonkey)

IE Tab + is an enhanced version of IE Tab. It supports FF 3.5 or greater, integrates IE Tab with Adblock Plus in the IE Tab engine, and synchronizes cookies between IE and Firefox. You can easily import settings from the original IE Tab into IE Tab +

Rated 3 out of 5 stars (72)
189,519 users

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (4)
2,648 users