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
Screengrab! saves webpages as images.
New features: upload to internet
This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.
The latest version is compatible with Thunderbird 24+ only (see below for details).
FireStorage Plus! - Manage web storage
An extra Firebug tab which lets you inspect and modify the local and session storage.