Works only on secondary blog
I've had this script installed in Firefox for maybe a month and it used to work fine. Now, it only works for a secondary tumblr blog I run, not my primary account blog. I have tried to reinstall, disable and re enable and tried using Chrome instead of Firefox but nothing works. It tells me it is unable to connect. It continues to be accurate for the secondary blog though.
could this be a tumblr related issue? I wonder because xkit has also stopped working.
Yes, there are certain issues in Tumblr servers that are messing with some scripts. The unfollower and follower checkers does a lot of request to Tumblr servers that are causing this type of scripts to work inappropriately.