We published several articles in the past that wrote about finding out who unfollowed you on Tumblr. But since all of the tumblr follower checker scripts no longer work (due to Tumblr changing their API policy) we decided to feature to tumblr follower trackers that actually work, XKit and Unfollower Hater.
This list of addons to track followers on tumblr does not include the hugely popular Missing-E, since they eliminitated the unfollower tracker feature as well from their App.
TumblrStalkr has been redesigned and it’s working well again, it should be the best since it works on all browsers
Check out the the scripts below and installation instructions.