I have the beta version 0.65. I followed all points indicated in the page:
http://tln.lib.mi.us/~amutch/pro/kmeleon/khistfiles.htm
but that's no working. Restarting KMeleon, but the line:
user_pref("browser.visited_color", "#FF0000");
is always cleaned from the file "pefs.js" !!
It was working before with the version 0.6