Google promotes FireFox heavily on its Google Adsense programs (referral ads) I've got no problem with this,
many websites are not adjusted to be displayed normal and fine using FireFox, undoubted the problem is with their designers and webmasters, cause they will lose 20-30 percent of web surfers by the way. I've got no problem with this too!, but... Today when I tried to open my own blog on blogspot, which belongs to Google Group, I saw the adsense box is out of shape! And I've got a big problem with this for sure!