From Edouard Gatouillat:
Unfriend Finder for Facebook is a realtime script that allows you to know wich one of your old friend removes you on Facebook. It also work with people you remove, and people who deactivate their account. A json database keeps record of your friend list, and compare to each refresh. Realtime notifications and counter in the facebook menubar/left filter. MenubarLink redirects you to /friends/ page, with two more links for "Unfriends" and "Awaiting request". Filter keeps you to your homepage.