This is for Firefox users...
* Install Greasemonkey 0.9.13...go to.....and click on ''Add to Firefox''
https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/

*then go to......
http://userscripts.org/scripts/show/58852
top of page you will see ''Unfriend Finder'' go to the right and click on ''Install'' (circled in yellow). After the install....restart Firefox.... then you should see an image of a monkey (circled in yellow...usually on top of page) See following image.



*now go to your facebook page and you should see ''Unfriend'' top of page ...click on it. (see image below)





There is another application of ''Unfriend'' go to …..
https://www.facebook.com/pages/Unfriend-Finder-Application/180449445314363

Follow the instruction on the page. This one is suppose to work with most browsers, except IE.
After you install it you will see an image of a person head, shoulders and -1 (in this case bottom right of page). click on it. (see image below)