Add-ons
Message and News Reading
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Copy Sent to Current
Allows to place a copy of sent messages (aka FCC) into the currently active folder or any other folder you choose, when you create the message. Usually the copies are placed into the 'Sent' folder. For replies, you may also move the original message.
Mnenhy
Requires Restart
The primary goal of the Mnenhy project is to make some enhancements to SeaMonkey MailNews/Thunderbird, since there're still plenty of comfort functions missing if compared to Netscape 4.x and other mail and news clients.
Nostalgy
Requires Restart
Keyboard shortcuts to change folder, move/copy messages, with folder name auto-completion.
Slideshow
Requires Restart
Displays a slideshow of picture attachments. When email has attached pictures, it displays "View as Slideshow" button next to the attachment. Button click pops a slideshow window with all the images, allowing you to zoom in/out, save...
ThreadKey
Strike the 'T' key to sort messages by thread, strike the 'U' key to sort them unthreaded again, just like the 'G' key switches to Grouped By Sort view.
Mark All Read Button
Requires Restart
Adds toolbar buttons to Mark All emails as Read, Mark Thread as Read, and Goto Next Unread Thread.
mouseless
Requires Restart
I did my best so that operation might be possible with a keyboard...
ConfirmFolderMove
Requires Restart
Introduces a preference that allows users to be prompted before moving folders.
NewsWorthy for Thunderbird 1.5
Requires Restart
Making Thunderbird newsworthy (Usenet client support)...
Email Notification Randomizer
Requires Restart
Extension to randomize the email notification sound. Each time an email is received, the configured email notification sound is updated from the set of wav files in the configured folder...
Reply In Group
Requires Restart
Adds "Reply In Group" and "Reply to sender" toolbar buttons to the main window. So it's easier to reply in Usenet...
FolderFlags
Allows users to edit the flags Thunderbird sets on folders.
Readonly Attachments
Requires Restart
Saves temporary files as read-only when showing attachments.
Tag the Bird
Requires Restart
Tag the Bird gives the power of tagging to Thunderbird.
Purge!
Requires Restart
Add toolbar icons to purge (compact folders) and/or delete junk messages to your toolbar and thread context...
RSS Linkify Subject
Requires Restart
Linkify Subject header with Content-Base URL when viewing RSS item to easily open it in...
Allow HTML Temp
Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).
Headers Toggle
Requires Restart
Gives Thunderbird a keyboard shortcut (H) to change how headers are displayed.
KbdMover
Requires Restart
Adds the ability to move mail from the keyboard with keystroke saving features similar to partial-completion-mode in Emacs...
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