Hi Delia!
1. Thunderbird is supported. Colin has advised how to back up your ReminderFox data. Once you've done that you can import all your existing reminders. See http://www.reminderfox.org/optionsdialog/#backup for details - there is a link to Restore from Reminderfox backup file in the Backup section.
2. I've checked and it appears that the Lightning add-on is only available for Thunderbird. See https://www.mozilla.org/en-US/projects/calendar/ for details. I don't know whether you could get it working for PaleMoon.
Paul
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ReminderFox - the simple Reminder application for Firefox and Thunderbird
http://www.reminderfox.org
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