User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:184.108.40.206pre) Gecko/20070119 SeaMonkey/1.1
Using XRESOURCES="/tmp/xrdb-$UID.$$" is bad, should be XRESOURCES=`
AFAIK this was already fixed. Can't find the bug report tho.
It's fixed in xfce 4.4.1, there is no temporary file anymore.
There been no bug reported via bugzilla.