frog in firefox

there is a picture sharing site
http://photoshack.us/
accessing with Firefox it does not show pics rather a frog
to remove the frog and see pics do the following:

On the firefox browsers address bar type 'about:config'

then on that page on filter type in 'network.http.sendRefererHeader'

double click on the 'network.http.sendRefererHeader' and change the value to 0 (zero).