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Colorific
Colorize entire web pages. Configure themes using sliders and drag-and-drop. Set domain preferences for automatic coloration.
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.
Send to Internals Requires Restart
Provides a special button to send mail to internals. "Internals" may be company, organization, or user group and so on.
Column Reader
Web reader for wide screens and long documents. Read with pleasure in attractive layouts.
Old-style smilies Requires Restart
Reverts the smilies in Thunderbird to those of version 2.
Thunderbird-DontRestoreTabs Requires Restart
Allows the user not to restore tabs at startup in Thundertbird
Page Colors & Fonts Buttons
Adds buttons to toggle the using the default page colors and fonts, and the page defined colors and fonts.
Zoom Button for Thunderbird Requires Restart
Zoom in, zoom out, and reset zoom with one toolbar button. Works in the Compose window too.
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.
QuickMultiselect Requires Restart
Adds a column with checkboxes so that you can select multiple messages with only a mouse click.
Large Fonts Requires Restart
This add-on enables you to change the font size of the plain text editor of Thunderbird.
Extensor
Quick access to add-on functions from a toolbar panel: Options, (De)Activate, Details, Home page, Review page, Donation page, Uninstall, Restart application.
Gravatars Requires Restart
Show a column with the Gravatar-picture and sender-name in email folders.
Email Addresses in Message Headers Requires Restart
Shows email addresses in message headers, including those of contacts, and provides control over message header presentation.
Highlight Unread Folders Requires Restart
This add-on enables highlighting the account names which contain unread messages.
ToggleFullHeaders Requires Restart
Allows you to customise the message panel buttons to add a "Toggle Headers" button that will switch between showing and hiding the full headers.
To create your own collections, you must have a Mozilla Add-ons account.