Add-ons
Miscellaneous
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Lightning
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.
6,823,584 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.6,823,584 users -
Allows bidirectional access to Google Calendar312,825 users -
German Dictionary (new Orthography) for spellchecking in Mozilla products226,797 users -
Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.91,744 users
Top Rated See all »
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Add menu commands for replying to multiple messages at the same time.599 users -
True "Send Later" functionality to schedule the time for sending an email.72,081 users -
Remembers last selected (hilited) extension/theme/plugin/userstyle in Add-ons Manager. Version 3.0 also includes sorting buttons. Turn off/on the add-on selection list box and/or fine tune behavior via its Options.26 users
Recently Added See all »
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A bugzilla companion (fixed version). Originally maintained by Fabrice Desré.29 users -
Enables toggling of replied, forwarded, and redirected states of messages.280 users
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Add menu commands for replying to multiple messages at the same time.599 users
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With MyAdFilter, free content creators propose you only one ad. Apart from those, as your usual ad-blocker, MyAdFilter disables all ads.15 users
See all 178 extensions in Miscellaneous »
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