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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.
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.
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.
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.
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.
Free/Busy
Requires Restart
Publish free/busy calendar file (*.ifb) via ftp or to a file. View other people's free/busy info in meeting organizer window. Integrate Thunderbird and Outlook calendars without Exchange server.
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.
BlunderDelay
Requires Restart
Thunderbird Extension: AutoSend Unsent Messages. Flushes entire outbox at regular intervals.
SmtpSelect
Requires Restart
A toolbar button providing easy access to choosing the default SMTP server in Thunderbird.
ThunderKeep
Version in Add-on bar
Requires Restart
Show the Firefox/Thunderbird version number in the addon bar (formerly called status bar).
WebApp Tabs
Allows you to configure a set of WebApps to open easily as tabs within Thunderbird trying to give them all the functionality that you'd find in Firefox.
Extension List Dumper
Requires Restart
This extension adds a button ("Dump list") to the Add-ons window. When this button is pressed, a new window is opened with the list of installed extensions, themes or plugins...
Play drums!
3e Calendar
Clean Subject
Requires Restart
"Clean Subject" cleans the subject from multiple occurrences of subject prefixes such as ("Re: Re-2: Re:") and postfixes that are inserted by other clients. Words like "[SPAM]" can be cleaned as well. These prefixes can be defined in the preferences.
To create your own collections, you must have a Mozilla Add-ons account.
