may I have the forum url.....
Its fine now, restarted firefox and it comes up, do you still need the forum url?
If it is solved, we don't need the url.
I've done this before go to the main index of the forums from FTP
then get a 16x16 icon or create it here
http://www.favicon.cc/
search for a website that can convert image format to .ico
upload the file in the index / main file of the forums from FTP