Developer reply by Tom Mutdosch
Rated 5 out of 5 stars
FIXED :)
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
To create your own collections, you must have a Mozilla Add-ons account.