If your browser does is not fully compatible with the SuperNova code (which would lead to the SuperNova interface not loading), then instead of a white/black/whatever screen, you will see a replacement to the interface which allows to download the SuperNova player and launch the game (in other words, it is a simplified but maybe better version of the official one!). It may also appear if the loading of a game page is too slow, but I guess it is not a big problem.
Changed how certain values were obtained, which might prevent some bugs in the future.