Dys is right in saying that they did drop some FF extensions, and that yes, they are using IE7 now...however, I do have the latest IE7 and the medals don't appear on that; actually, my privacy report says they are getting blocked. I tried lowering my settings and still nothing. Its not a big deal since I pretty much exclusively use FF (and the load time was MUCH faster on FF) but I could see where the IE7 guys could be annoyed (and I end that with tho, if you still have IE6, WHAT IS WRONG WITH YOU?).
Also, the quotes work and are pretty cool, especially how they say which reply # they are quoting (and they include a QuickLink button for reference back to that quote, very cool)