Try viewing any page that uses Mollom to protect against spam, eg a page with comments. It can be in any SS site including:
http://demo.silverstripe.com
Right now no comments page on any SS site will load - it will just wait forever before eventually timing out. It doesn't matter what browser you are using or what version of SS - if your comments use Mollom, then that can't be seen by anybody.
I think this one needs an urgent patch! If Mollom is down, so is your site.