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.
6,168,680 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.6,168,680 users -
German Dictionary (new Orthography) for spellchecking in Mozilla products359,968 users -
Allows bidirectional access to Google Calendar304,892 users -
Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.162,488 users
Top Rated See all »
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True "Send Later" functionality to schedule the time for sending an email.66,304 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.313 users -
Flash player plugin - unofficial xpi repack for 64bit browsers. Use when official plugin installer is not suitable. All binary files are copyrighted by their authors and distributed for free.2,726 users -
Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.10,928 users
Recently Added See all »
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A bugzilla companion (fixed version). Originally maintained by Fabrice Desré.18 users -
Enables toggling of replied, forwarded, and redirected states of messages.135 users
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Add menu commands for replying to multiple messages at the same time.403 users -
With MyAdFilter, free content creators propose you only one ad. Apart from those, as your usual ad-blocker, MyAdFilter disables all ads.33 users
See all 178 extensions in Miscellaneous »
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