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.
6,518,445 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.6,518,445 users -
German Dictionary (new Orthography) for spellchecking in Mozilla products221,989 users -
Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.88,795 users -
True "Send Later" functionality to schedule the time for sending an email.68,964 users
Top Rated See all »
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True "Send Later" functionality to schedule the time for sending an email.68,964 users
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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.34 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.69 users
Recently Added See all »
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A bugzilla companion (fixed version). Originally maintained by Fabrice Desré.26 users -
Enables toggling of replied, forwarded, and redirected states of messages.235 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.19 users -
XDM integration module for Firefox on Linux and Mac1 user
See all 178 extensions in Miscellaneous »
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