Found the solution! Rated 5 out of 5 stars

For anyone suffering the same problem - here's a link to how to reset the version flag: http://support.mozilla.com/en-US/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser?s=firefox+reports+wrong+version&as=s

This user has 2 previous reviews of this add-on.