ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.
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Firefox style sidebars for SeaMonkey...
The first and only download manager/accelerator built inside Firefox!
FlashGot Mass Downloader Requires Restart Featured
Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.
Lightning Requires Restart Featured
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.
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NewsFox is an efficient 3-pane(email) style Atom/RSS feed reader.
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.