If they want to block firefox, let them (Score 1)

It is their choice to decide who can see their content. If they choose to block a not insignificant portion of internet users, it is their choice. Of course, since the page will not be of use to as large a portion of the internet user space as other sites that don't block firefox, perhaps search engines like google should lower the rankings of their site so that they aren't directing users to pages that won't load. In fact, this sounds a little bit like cloaking - they have one page that is returned for the search engine, and a different page for humans using certain web browsers.