http://www.liamsmart.co.uk/Downloads/multiBox/ used to work with Firefox. I last tested it successfully about September 2012, with whatever the current version of Firefox was. I tested it tonight, with 21.0 and it was not working. It works with current versions of IE and Opera. I reinstalled Firefox version 20.0 and that does not work either. I had Firefox version 12.0 on a laptop and it was working tonight. I upgraded the laptop version to 21.0 and it no longer works.