Interface Customizations

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Nightly Tester Tools Requires Restart

Useful tools for the nightly tester.

Rated 4 out of 5 stars (194)
38,567 users

Menu Wizard Requires Restart

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 (198)
72,710 users

Simple Locale Switcher Requires Restart

An easier management of the user interface language

Rated 5 out of 5 stars (8)
24,928 users

Display Mail User Agent Requires Restart

Displays icon for user agent of received mails.

Rated 4 out of 5 stars (104)
33,081 users

Google Hangouts Web Messenger

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

Rated 5 out of 5 stars (3)
2,900 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 (30)
3,939 users

ThreadKey Requires Restart

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 (23)
1,667 users

GNotifier

Add-on for Firefox and Thunderbird. Replaces built-in notifications with the OS native notifications. It supports most Linux Desktop Environments, Windows 8.1 & 10.

Rated 5 out of 5 stars (24)
13,766 users

FireTray Requires Restart

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 (269)
36,000 users

FolderFlags Requires Restart

Allows users to edit the flags Thunderbird sets on folders.

Rated 5 out of 5 stars (8)
4,369 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 (116)
25,276 users

KeePass Helper Requires Restart

Adds a hostname, URL, or email account ID to the application's window name (e.g., that of Firefox or Thunderbird) to make it recognizable to password manager utilities like KeePass.

Rated 4 out of 5 stars (35)
4,780 users

RC Print Requires Restart

Adds a "Print" option to the Right-Click context menu.

Rated 5 out of 5 stars (2)
1,430 users

IMAP Received Date Requires Restart

Make the “Received” column in IMAP folders show when messages were actually received.

Rated 5 out of 5 stars (6)
1,938 users

WebPG for Mozilla Requires Restart

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

Rated 3 out of 5 stars (24)
2,438 users

CuteMenus - Crystal SVG Requires Restart

Note from Mozilla: This add-on has been discontinued. Try Menu Icons Plus instead.

Adds icons to all menus along with some other features...

Rated 4 out of 5 stars (103)
2,648 users

Tab Wheel Scroll

Switch tabs by scrolling with the mouse wheel in the tab bar.

Rated 4 out of 5 stars (126)
10,886 users

jQuery Requires Restart

jQuery and jQuery UI embedded in browser

Rated 4 out of 5 stars (7)
2,494 users

Remember Mismatched Domains Requires Restart

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)
2,363 users

Speed Start

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

Rated 5 out of 5 stars (53)
7,104 users