Interface Customizations

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YouTube Video Player Pop Out No Restart

YouTube Video Player Pop Out lets you pop out YouTube videos so that you can watch YouTube videos while you surf.

Rated 4 out of 5 stars (3)
29,023 weekly downloads

Stylish

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.

Rated 4 out of 5 stars (818)
23,210 weekly downloads

Theme Font & Size Changer No Restart

Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.

Rated 5 out of 5 stars (173)
5,774 weekly downloads

Forecastfox (fix version)

Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.

Now Available for: Firefox, Thunderbird and SeaMonkey!

Rated 5 out of 5 stars (201)
3,217 weekly downloads

YouTube Anywhere Player No Restart

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

Rated 5 out of 5 stars (63)
2,613 weekly downloads

Menu Wizard

Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (175)
2,369 weekly downloads

F.B. Purity - Cleans Up Facebook No Restart

F.B. Purity hides the ads, app spam and other annoying clutter from your facebook news feed, lets you increase the font size, change colours plus many more features and generally makes Facebook a lot less annoying to use.

Rated 5 out of 5 stars (89)
2,038 weekly downloads

Classic Toolbar Buttons No Restart

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

Beta builds on versions page!

Rated 5 out of 5 stars (150)
1,838 weekly downloads

FireTray

A system tray extension for Linux and Windows, 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 (260)
1,731 weekly downloads

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (8)
1,414 weekly downloads

Open With Google Chrome No Restart

Open With Google Chrome sends pages from Mozilla Firefox to Google Chrome.

Rated 4 out of 5 stars (6)
1,179 weekly downloads

Lightweight Themes Manager No Restart

Manage your installed personas (lightweight themes).

Rated 5 out of 5 stars (9)
1,125 weekly downloads

Forecastfox Weather

Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.

Rated 4 out of 5 stars (1,040)
898 weekly downloads

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 (129)
833 weekly downloads

Google Hangouts Web Messenger No Restart

Google Hangouts Web Messenger brings Google Hangouts right into your browser to chat with your friends.

Not yet rated
827 weekly downloads

Speed Start No Restart

Speed Dial & Start Page with flexible layout for fast access to sites via visual bookmarks

Rated 5 out of 5 stars (36)
768 weekly downloads

Customizations for Adblock Plus No Restart

This extension provides various customization options for the Adblock Plus user interface.

Rated 5 out of 5 stars (13)
659 weekly downloads

Scriptish

The greatest user script engine on the Internet (a fork of Greasemonkey).

Rated 4 out of 5 stars (119)
659 weekly downloads

Open With Internet Explorer No Restart

Open With Internet Explorer sends pages from Mozilla Firefox to Internet Explorer.

Not yet rated
643 weekly downloads

QuickFolders (Tabbed Folders)

The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.

See new mail at a glance after automatic filtering - supports quickFilters addon!

Rated 5 out of 5 stars (112)
640 weekly downloads