Appearance and Customization

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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 (89)
1,570 weekly downloads

Lightweight Themes Manager No Restart

Manage your installed personas (lightweight themes).

Rated 5 out of 5 stars (6)
1,362 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 (123)
1,132 weekly downloads

Simple Locale Switcher

An easier management of the user interface language

Rated 5 out of 5 stars (6)
866 weekly downloads

HTitle

Hide title bar if window is maximized.

This extension created only for GNOME 3. It can create problems with another DE (KDE, XFCE, etc). However, you can use HTitle at your own risk (need enable "legacy" mode on settings page).

Rated 5 out of 5 stars (86)
846 weekly downloads

Noia Fox options

Options manager and fixes for Noia Fox theme 3.x.x

Rated 5 out of 5 stars (9)
693 weekly downloads

Color Folders

Color your Folder Treeview Icons!

Rated 4 out of 5 stars (118)
644 weekly downloads

Lightning Calendar Tabs

Displays tabs which allows quick navigation between time periods in Lightning calendar. All views of calendar are supported. Color of tab texts can be adjusted.

Rated 4 out of 5 stars (7)
594 weekly downloads

GNotifier No Restart

Add-on for Firefox and Thunderbird. Integrates Firefox's notifications with the OS's native notification system. It supports most Linux desktops and Windows 8.

Rated 5 out of 5 stars (37)
481 weekly downloads

Simple Timer

A timer/clock residing in the toolbar.

Rated 5 out of 5 stars (104)
471 weekly downloads

OutlookAlike BETA

Makes Thunderbird looking like Outlook.

Rated 4 out of 5 stars (25)
336 weekly downloads

Tag Toolbar

Add toolbar for toggling tags.

Rated 4 out of 5 stars (33)
277 weekly downloads

Hide Local Folders

Removes the "Local Folders" entry from the folder pane.

Rated 4 out of 5 stars (15)
262 weekly downloads

Color Transform No Restart

Adapt page colors to your taste or need. Save your favorite color scheme for automatic coloration. Comes with 18 predefined themes and 24 basic transforms for hue, saturation, lightness and opacity. For Firefox 24.0 and above.

Rated 3 out of 5 stars (8)
230 weekly downloads

Element Inspector No Restart

Shift-RightClick any element to open it in DOM Inspector.

Rated 5 out of 5 stars (24)
204 weekly downloads

Extra Format Buttons

Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.

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

Personas Shuffler No Restart

Change your Personas theme on each browser load.

Rated 5 out of 5 stars (12)
188 weekly downloads

Show All Body Parts No Restart

Enable the View | Message Body As | All Body Parts message display mode.

Rated 5 out of 5 stars (16)
187 weekly downloads

G-Hub Lite

Adds Google Tabs to Thunderbird. Services include Voice, Calendar, Drive (Docs), Contacts, Groups, News, Books, Play, Maps, Sites, Finance, Picasa, Plus. Need Google Apps? Check out G-Hub Pro: http://www.schiffner.com/index.php/software/g-hub-pro

Rated 3 out of 5 stars (17)
174 weekly downloads

Big Navigation No Restart

Increases the navigation links on the pages

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