Your "official" list of compatible browsers lists Firefox 7 & 8. I use Aurora (aka Firefox 11, the Alpha test version of Firefox.) with no problems discovered yet. So there should be no problems with Firefox 9, the current version or Firefox 10, the Beta test version. Just thought I'd let you know. Personally I find alpha and beta versions of Firefox to be more stable and to have fewer problems that current version of Microsoft's Internet Explorer.
I have yet to find any other browser that is less stable, (and less secure), than any version of IE. Heh!
Personally, I won't use IE on my own PC; if a website "requires" it, I simply won't visit that site.
Atm running latest version of Chrome, as Firefox uses quite a bit more RAM; and as my 'puter is archaic, that's still a major issue for me. ( I'll likely run Unix / Linux O.S. on my next machine; as I really don't care for most of M.S software.)