I just recently came across that in Mozilla. So I check it in IE and the regular google page came up. Refreshed a few times in Mozilla, and the mobile page still came up (and had me worried since I don't like its looks). I clicked around, and then decided to exit Mozilla and tried again and after that it worked normally.

I guess I'm glad I'm not the only one who ran into this weird thing...I really didn't enjoy the new layout I saw