UPDATE! This appears to an account issue and not a browser issue. [wah wah wahhh... sorry conspiracy buffs] Found this thread in the GA Help, it is a bit old but allows you to manually submit your account to be fixed – Google Analytics Account Error Manual Fix
It looks like Google Analytics is broken for both IE (Internet Explorer) and FF (Firefox) BUT NOT for Google Chrome. Try it yourself, and below are screenshots of the error in IE and FF.
Caution: Conspiracy Theory
Is this a Google attempt to push a little bit more Chrome usage? If they intentionally block IE & FF from accessing the Google Analytics site and cite a compatibility issue they could send the millions of users of the free analytics software into the arms of Chrome bolstering adoption of the browser and capturing additional market share. This would be beyond devious! Also, illegal, right?
Here are the error messages in IE & FF: