Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
Allows bidirectional access to Google Calendar
Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.
It adds some options to launch easily other profiles and the Profile Manager.
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
Allow to redirect (a.k.a. "bounce") mail messages to other recipients.
Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.
Displays icon for user agent of received mails.
Enable the View | Message Body As | All Body Parts message display mode.
Add arrow buttons for rotating among folder views, and switch to "All Folders" view when hovering over the folder pane during drag & drop.
Integrate QR codes for calendar events into tooltips for easy transfer to mobile devices.
Adds a folder view showing unread folders, including their hierarchy. This is helpful if you have a lot of folders to make sure you don't miss an email, or if you are not happy with the existing unread folders view.
Allows auto saved drafts to be stored in a separate folder from purposely saved drafts.
Thunderbird 31: Use v0.3.0b1 from https://addons.mozilla.org/en-US/thunderbird/addon/auto-save-drafts-folders/versions/
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