1 306 387 gebruikers
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.
273 570 gebruikers
Allows bidirectional access to Google Calendar
188 997 gebruikers
LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
147 176 gebruikers
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
86 302 gebruikers
Switch the signature on/off or choose a new one from your predefined set...
97 851 gebruikers
ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.
68 826 gebruikers
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 38+ only (see below for details).
19 309 gebruikers
Contact Tabs enhances Thunderbird to give you quick access to all your contacts directly from Thunderbird's main window: Use the powerful search field to find your contacts and open them in a new tab for viewing and editing.
176 564 gebruikers
This extension is for those TB3 users who want the multiple-columns view that TB2 allowed
75 051 gebruikers
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
52 644 gebruikers
True "Send Later" functionality to schedule the time for sending an email.
85 312 gebruikers
Help make Firefox better. The Add-on Compatibility Reporter enables you to report if the Firefox add-ons that you're using are working properly.
63 236 gebruikers
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
144 510 gebruikers
Add symbol in header plane to switch between compact and expanded view. Options to switch between one or two lines compact view, which buttons should be displayed in header pane. For Thunderbird 36 and older use version 2.0.9 (see version history)