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.
6,891,657 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.6,891,657 users -
Allows bidirectional access to Google Calendar309,960 users -
German Dictionary (new Orthography) for spellchecking in Mozilla products218,094 users -
Allow to redirect (a.k.a. "remail") mail messages to other recipients.37,821 users
Top Rated See all »
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Use SeaMonkey as a standalone e-mail client. Set up a default browser for links opened from Mail & Newsgroups.151 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.24 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.66 users
Recently Added See all »
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Lightweight add-on that automatically copies any highlighted text to clipboard.14 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.16 users -
XDM integration module for Firefox on Linux and Mac1 user
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Reinstates the extensions.checkCompatibility preference.170 users
See all 179 extensions in Miscellaneous »
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