Rated 4 out of 5 stars

As reported for Thunderbird... in Firefox 26 Reminder Fox 2.1.4 cannot remove icon from main toolbar. Changed settings wont save. It's a shame because I like it but this is a real issue when you already have a lot of icons on your main toolbar.

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