Up & Coming Extensions

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about:config Button

Open about:config to change hidden settings that cannot be edited from the Options window. All Mozilla based programs have settings that can not be changed in the options window.

Rated 5 out of 5 stars (5)
3,297 users

SQLite Manager Requires Restart

Manage any SQLite database on your computer.

Rated 4 out of 5 stars (70)
177,000 users

Lightweight Themes Manager

Manage your installed personas (lightweight themes).

Rated 5 out of 5 stars (13)
9,752 users

Stylish Requires Restart

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 (797)
401,607 users

QuickFolders (Tabbed Folders) Requires Restart

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 (118)
24,387 users

Themes Menu Requires Restart

Adds Themes menu to the Tools and Titlebar menus. Includes toolbar icon.

Rated 4 out of 5 stars (16)
13,782 users

Single Key Tab Switch Requires Restart

Single Key Tab Switch provides configurable single hotkeys for switching tabs, like the 'Single-key shortcuts' feature of the Opera browser.

Rated 4 out of 5 stars (28)
1,012 users

ToneQuilla Requires Restart

Adds a new action to mail filters to allow playing a particular sound when the filter matches. Also includes several sample sound files.

Rated 4 out of 5 stars (16)
2,936 users

Unsubscribe from Mailing List Requires Restart

Allows recipients to cancel their newsletter subscriptions in the thunderbird interface.

Rated 4 out of 5 stars (13)
1,309 users

Firesizer Requires Restart

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 (133)
21,827 users

InfoLister Requires Restart

Lists installed add-ons (extensions, themes, plugins). Mozilla does not allow me to publish the version compatible with Firefox 48+, see http://forums.mozillazine.org/viewtopic.php?f=48&t=2084957&p=14715558#p14715558 for details.

Rated 4 out of 5 stars (34)
1,038 users

Nostalgy Requires Restart

Keyboard shortcuts to change folder, move/copy messages, with folder name auto-completion.

Rated 5 out of 5 stars (150)
9,018 users

Extension Auto-Installer

Extension Auto-Installer is a helper for Firefox/SeaMonkey/Thunderbird extension developers: it allows automatically adding or updating browser extensions, e.g. via command line tools. This makes testing your changes easier.

Rated 5 out of 5 stars (25)
3,145 users

Messenger for Facebook™

Messenger for Facebook™ lets you bring a Messenger right into your browser to chat with your friends.

Rated 5 out of 5 stars (38)
23,787 users

LastPass Password Manager Requires Restart

LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.

Rated 4 out of 5 stars (1,514)
716,965 users

Dorando keyconfig Requires Restart

A modified Dorando's addon to rebind keyboard shortcuts. It is designed to be a drop-in replacement, keeping your old settings. (See details for upgrade instructions.)

As of version 2016.2, Custom keys (using custom JavaScript) work again!

Rated 5 out of 5 stars (31)
4,828 users

DownThemAll! Featured

The first and only download manager/accelerator built inside Firefox!

Rated 4 out of 5 stars (1,743)
1,123,380 users

S3.Google Translator Requires Restart

S3.Google Translator adds the power of Google Translate’s automatic translations to your browser!
It supports translation of selected text, entered phrase or whole webpage between any of 80+ languages.

New Feature: Language learning!

Rated 5 out of 5 stars (351)
363,772 users

FlashGot Mass Downloader Requires Restart Featured

Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.

Rated 5 out of 5 stars (526)
680,061 users

Keychain Services Integration Requires Restart

Store usernames and passwords in your Mac OS X Keychain.

Rated 4 out of 5 stars (93)
3,794 users