Rated 2 out of 5 stars

ReminderFox is running under the latest Thunderbird for Windows and the update is a disaster!

The icon is now missing from the status bar.

Every 5-10 minutes, Thunderbird freezes. The problem goes away when I disable ReminderFox.

5 stars when the bugs are swatted. It's unusable now.

This review is for a previous version of the add-on (2.1.4.1-signed). 

Sorry for the troubles! Please try the latest update which has resolved these issues:
https://addons.mozilla.org/en-US/firefox/addon/reminderfox/versions/2.1.4.1