Social Fixer (q.v.) used to contain a Friend Tracker. However, since SF 8.0
this has no longer been the case because Facebook objected and placed
pressure on the author to remove it. This script is an attempt to
r###rrect the Friend Tracker. Some of the code from SF has been re-used
(with apologies) but it has been simplified, so if it no longer works, sorry!

When you load Facebook, this script will request a copy of your friends list
and will display a panel in the right-hand sidebar to note if any friends have
gone missing.

This script has been tested a bit in SeaMonkey with GreaseMonkey 2.x and only
very minimally in Firefox and Chrome. It no longer works in Scriptish because
Scriptish has issues that prevent xmlhttpRequest from working.