Appearance and Customization

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CustomizeMyBird

CustomizeMyBird add-on offers ui tweaks to improve Thunderbirds appearance (squared tabs, custom tab height, alternative Add-on Manager appearance, compact main toolbars and more).

Rated 5 out of 5 stars (2)
258 weekly downloads

Element Inspector

In the DOM Inspector,quickly navigate to the any elements

Rated 5 out of 5 stars (30)
253 weekly downloads

G-Hub Lite Requires Restart

Add Google Tabs to Thunderbird! Services supported: Voice, Calendar, Drive, Docs, Sheets, Slides, Hangouts, Plus, Photos, Contacts, News, Maps, & many more. Need Google Apps? Check out G-Hub Pro: http://www.schiffner.com/index.php/software/g-hub-pro

Rated 4 out of 5 stars (3)
239 weekly downloads

OutlookAlike BETA Requires Restart

Makes Thunderbird looking like Outlook.

Rated 4 out of 5 stars (29)
236 weekly downloads

YouTube 2 Player

Send YouTube video links to an external player, downloader, etc,

Rated 5 out of 5 stars (8)
233 weekly downloads

Window Master

Functionality for multiple screens and windows. Easily open links in other windows or on other screens, move or merge tabs, and move or merge entire windows. With graphical controls for grid positioning.

Rated 4 out of 5 stars (12)
203 weekly downloads

Show All Body Parts

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

Rated 5 out of 5 stars (17)
202 weekly downloads

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)
194 weekly downloads

Send Later Button Requires Restart

A simple button to invoke the (already existing) send later functions.

Not yet rated
184 weekly downloads

Profile Buttons

A button to be able to open the profile folder, along with two buttons to create profiles, and also switch the current profile.

Rated 3 out of 5 stars (4)
173 weekly downloads

Extra Format Buttons Requires Restart

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

Rated 5 out of 5 stars (10)
170 weekly downloads

CuteButtons

Adds icons to buttons and/or menus.

Rated 4 out of 5 stars (105)
155 weekly downloads

No Small Text

Set a minimum text size for all web content. Use the toolbar button to switch it on and off. NEW: Three preset sizes. NEW: Use mouse scroll on the toolbar button.

Rated 4 out of 5 stars (9)
152 weekly downloads

Menu Filter

Keep your menus in check by filtering out items you never use.

Rated 4 out of 5 stars (49)
145 weekly downloads

Colorific

Colorize entire web pages. Configure themes using sliders and drag-and-drop. Set domain preferences for automatic coloration.

Rated 3 out of 5 stars (9)
134 weekly downloads

Perfect View

Image viewer with smooth dynamic zoom, pan and rotate. View slide shows of images or files and capture page elements and tab content. Apply image filters. Save images in various formats.

Rated 4 out of 5 stars (9)
126 weekly downloads

All Menus Button

Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.

Rated 5 out of 5 stars (8)
123 weekly downloads

Stylish-Custom Requires Restart

custom additions to Stylish extension

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

Checkbox Column Requires Restart

Adds a custom column to Thunderbird's messages list (thread tree), making it easier to select multiple messages on devices with a touchscreen display.

Rated 5 out of 5 stars (2)
115 weekly downloads

Safe for Amoled

Darkens the background of the page

Rated 3 out of 5 stars (20)
114 weekly downloads