I've been testing your add-on for about a week or two, but so far detected ONE actual unfollower only. All the others shown after running a scan had NOT unfollowed me, they were utterly random or fictitious picks of accounts that had been following me for years. So my question is: How on earth is this meant to work? - I will deactivate it now, waiting for necessary amendments.

Maybe you should contact your colleague running a similar extension for Chrome called "Unfolllr" (I can't add the link here, so please google it) which has been running nicely for months and so far NEVER produced a false result.