I'm having the same issue since today too. Using it on chrome on win 10 64-bit.
Will use firefox and edit this comment for update/comparision.
Edit: I still prefer the chrome version as when in full screen in firefox, when you hover your mouse to top it goes to browser menu. Sometimes, when pressing store or anything,it is really close to the Close[X] button. I've mistakenly closed it two times already. So I'll just stick to chrome for now.
Also: Firefox seems to take my inputs at a delay it seems. Example: when I press movement controls WASD it has a slight delay for whatever reasons.
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