Add-ons
Most Popular See all »
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True "Send Later" functionality to schedule the time for sending an email.119,527 users -
Adds the Google Calendar web interface in a new Thunderbird tab. Creating and viewing events works like in a browser (Firefox, Chrome, ...)19,522 users -
Displays tabs which allows quick navigation between time periods in Lightning calendar. All views of calendar are supported. Color of tab texts can be adjusted.15,856 users -
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.11,870 users -
This extension is no longer needed. Thunderbird has native CalDAV and CardDAV support.9,391 users -
Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync7,435 users
Top Rated See all »
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Macro Template is to replace mail templates with macros for date formatting.597 users -
True "Send Later" functionality to schedule the time for sending an email.119,527 users
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Integrates calendars events with Gnome clock applet627 users
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Extension for Lightning: Allows the use of Markdown in Task descriptions and renders them as HTML in the TaskView.29 users
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TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.11,870 users
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This extension is no longer needed. Thunderbird has native CalDAV and CardDAV support.9,391 users
Recently Added See all »
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Create and attach calendar invitations directly from Thunderbird's email compose window. Simple meeting scheduling without switching apps.0 users -
Select events with the mouse and move them to another calendar or delete them – one or many at once, by drag and drop, menu or button. With week view, list, ICS backup and undo.1 user -
More than Thunderbird's task list: subtasks, start dates, tags, saved views, advanced filters, shortcuts. Tasks and events on one calendar, plus contacts. Syncs with CalDAV/CardDAV and Tasks.org. Tasks free; Calendar and Contacts Pro after a trial.20 users -
Microsoft 365 / Teams calendar integration for Thunderbird with Microsoft Graph, OAuth2/PKCE and the M365 Space, without the native-calendar Experiment API.50 users
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A clear month view in the style of classic desktop planners, in its own tab: flip month by month with the mouse wheel, open, create, hide, compact, export as ICS and delete events (with backup).34 users -
Finds duplicate calendar events – also across calendars –, shows them in groups and deletes the entries you select, with an automatic ICS backup.17 users
See all 102 extensions in Calendar and Date/Time »
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