FIREFOX=/home/jcomeau/vista_home/AppData/Local/Mozilla/Firefox/
CACHE=$FIREFOX/Profiles/6vhfgx6q.default/Cache/
for file in $(ls $CACHE); do
 echo Checking $CACHE/$file
 head -c 3 $CACHE/$file | hexdump -C
 if [ "$(head -c 3 $CACHE/$file)" = "FLV" ]; then
  cp $CACHE/$file ~/vista_home/tmp/$file.flv
 else
  echo $CACHE/$file not a Flash video
 fi
done