Appearance and Customization
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.
AdvancedTasks Requires Restart
Thunderbirds Lightning Extension: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.
Lightning Colors Reminder Requires Restart
Let's show the calendar color on Lightning reminders!
AddressBook in Tab Requires Restart
Adds a button that can be put in toolbars which opens the addressbook in a new tab like pastismans AddressBookTab
No Delete Requires Restart
Prevents to delete messages from your disk. Note that it's OK to move mail into trash folder itself.
Switch Link External Handler Requires Restart
Provides abilities to switch external handlers to open links.
Force Hide Message Pane Requires Restart
Force hide message pane at startup.
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
This add-on offers ui tweaks to improve Thunderbirds appearance (squared tabs, custom tab height, alternative Add-on Manager appearance, compact main toolbars and more). v2.0.5+ for Fx52-61+
Search Results Sort By Date Not Relevance Requires Restart
Makes search results sort by "date" instead of "relevance" by default.
Enhanced Priority Display Requires Restart
Enhanced thread pane display of message priorities.
Adds icons to buttons and/or menus.
Disable DragAndDrop (Thunderbird) Requires Restart
A Thunderbird extension which disables drag and drop in the folder pane.
This extension prevents unintended folder movement.
Keep your menus in check by filtering out items you never use.
This extension is not being converted to a WebExtension.
Signature Switch Requires Restart
Switch the signature on/off or choose a new one from your predefined set...
Move the Thunderbird menu bar to the top. Choose from a selection of visual styles + colors. Add frequently used bookmarks and an avatar icon without wasting precious screen space. Bookmark your favorite sites, emails, folders or configuration pages.
Get/Send-Button Requires Restart
A combined Get/Send-Button and a popup menu with additional functions.
You may want to use it together with the following Add-ons:
* Send Later Button (by me / Alexander Ihrig)
* Send Later (by jikamens)
Lightning Calendar Tabs Requires Restart
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.
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.
The 'NoiaButtons' add-on offers cartoonish toolbar button icons (known from Noia themes) for default theme and lightweight themes. Further more lite silver and dark versions of Noia themes are included.