Add-ons
Calendar and Date/Time
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Send Later
True "Send Later" functionality to schedule the time for sending an email.
77,664 users -
TbSync
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.
37,253 users
Most Popular See all »
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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.7,391,484 users -
True "Send Later" functionality to schedule the time for sending an email.77,664 users -
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.37,253 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.22,083 users -
This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync". Including iCloud, Google, ownCloud, Nextcloud, Radicale and many more.19,471 users -
Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync18,899 users
Top Rated See all »
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Add sync support for Exchange ActiveSync (EAS v2.5 & v14.0) accounts to TbSync18,899 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.37,253 users
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True "Send Later" functionality to schedule the time for sending an email.77,664 users
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This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync". Including iCloud, Google, ownCloud, Nextcloud, Radicale and many more.19,471 users
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Configure the 'Date' and 'Received' columns and displayed date in the message pane using custom formats. You can even use different date formats for emails with today's date, yesterday's date, dates in the last week, or dates older than a week.92 users -
Shows the calendar week Thunderbird/Lightning calendar's moth and multi-week view.59 users
Recently Added See all »
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Adds a button to open Google Calendar in a new Tab34 users
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Abrir URL de G Suite en pestañas (por el momento solo están los botones de Calendar y Keep)163 users -
Add Microsoft Office 365 Tabs to Thunderbird! Services supported by M-Hub Lite: Calendar, People, OneDrive, Word, Excel, PowerPoint, & Bing. Need business or enterprise support? Get M-Hub Pro: https://www.schiffner.com/software/m-hub-pro148 users -
Allows custom synchronization intervals for remote calendars imported by Lightning Calendar (no fiddling in about:config necessary)319 users
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Configure the 'Date' and 'Received' columns and displayed date in the message pane using custom formats. You can even use different date formats for emails with today's date, yesterday's date, dates in the last week, or dates older than a week.92 users
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An extension to show embedded Outlook calendar (vcal / ics) parts.
Thunderbird doesn't show calendar parts from Outlook appointment emails. This addon adds a button to download the embedded appointment as ICS to import it into another calendar.622 users
See all 48 extensions in Calendar and Date/Time »
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