It does NOT show WHO unfriends you, it just shows the numbers of plus and minus friends. Nothing more.
Behind of it - coming hidden promo and adds of block adblock.

Good

good

不會用
臉書沒有出現Unfriend Finder的捷徑

I feel this is misleading. Each time I receive a notice that someone has unfriended me, I click to see who it is. Instead a message comes up promoting an app called, "BlockAdblocker". I disabled all ad blockers, & "unfriender" still did not do its job while still promoting "BlockAdblocker". So I hope this note is still published. If there is some answer to this app's problem, let us all know.

lustige Idee und es funktioniert..

useless

I never had a problem using this plugin but unfortunately it's not available for Chrome anymore and I hope that I can use this in the future. Thanks

probably tries to steal your data. Do not install!

Versions 1.3.1 and 1.3.2 not work in Firefox 43.0.4, :-( was a great extension.

I'd like to file a bug report, but there's no info here about how to get in touch.
So I posted it here:
http://gsm.fjellner.com/2015/12/17/bug-report/
unfriend finder 1.2.4
firefox 42.0
Windows 7

Two days after I installed this addon, I made a new friend. The button in the toolbar changed. I was curious so I clicked on the button. Bad mistake. Firefox now opened up hundreds of new tabs, probable one for each friend.

Crap.

Edit: Seems to work a lot better now :)