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Outgoing Message Format
Requires Restart
Set the default outgoing message format to Auto-Detect, Plain Text Only, Rich Text (HTML) or Plain and Rich (HTML) Text.
WebDAV for Filelink
Requires Restart
Adds the possibility to use a WebDAV store for Filelink. With this extension you can link attachments to a WebDAV service, for example as provided by Apache's mod_dav or some public services.
Addons Quick Search
Requires Restart
Type first letters of add-on name to find them in the list or press Ctrl+↑/↓ to switch between add-ons categories.
Additionally remember and restore last selected item in each list.
TB Menubar Unread Notifier
Requires Restart
Output the number of unread messages in all inboxes into the temporal file /tmp/testUnread. As a result, this output file can serve as an input for other applications to read and show notification either on a dock bar or on the menubar.
Return Receipt Toolbar Button
Requires Restart
Allow you to add a Return Receipt button to mail compose window toolbar.
.vcs Support
Add-ons Button
Opens the Add-ons window to perform tasks on your installed Extensions, Themes, Plug-ins and Language packs.
Yandex.Metrika for Thunderbird
ThunderCal
Requires Restart
ThunderCal simply gives you a toolbar button that you can use to run Google Calendar inside Thunderbird. Inspired by the ThunderWave add-on.
Restartless Restart
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
Trashcan
Requires Restart
Have you ever accidentally deleted an event and didn't notice? Undo is no longer available? Then this extension is for you! All deleted items are put into a special Trashcan calendar for your safety.
InspectorWidget
Requires Restart
Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.
No More Install Delay
UPDATE: XPI delay has been removed in Firefox 40!
Disable the install delay in Firefox. New 2.0 version now includes GreaseMonkey scripts!
Unlike similar addons, this works on Firefox 4 and beyond.
Free Memory Button
Restart application
Requires Restart
Restart the application with one click (or Ctrl Shift Z)
DragToCompose
Requires Restart
Enables dragging a file to Thunderbird for composing a new message without opening composer window first.
Restart App Button
Restart the current application, as you might need to do after installing a new extension or theme.
tasks & mails
Requires Restart
Tasks and emails management in a Thunderbird extension. tasks are stored in emails folder and it's possible to link an email to a task.
See all in one, emails and tasks (no more pain to synchronize a task manager).
Send Filter
Requires Restart
This add-on allows you run your message filters automatically on outgoing messages after sending. In other words, it's a outgoing filter for thunderbird and seamonkey.
To create your own collections, you must have a Mozilla Add-ons account.
