However, the problem is…
How does Facebook Friends Mapper Chrome extension work?
How to use Facebook Friends Mapper Chrome extension?
1. Install Facebook Friends Mapper extension from Chrome web store.
3. You will find 'Reveal Friends' option on Friends tab.
Just one condition to meet:
Facebook user, whose friends list you want to target, must have at least one mutual friend with you, and doesn't matter if you are friends with him/her or not.