Tried the Physics rolling project that comes with C2 in Firefox and Chrome, and the gameplay is twice as fast in Chrome.
The fps shows that it runs at 120fps, which should just make it runs smoother, not faster than FireFox's 60fps. Chrome bug? Or Firefox bug (being too slow)? I'm used to working with FF as a test browser.
EDIT: Not happening with the Space shooter or Platformer projects. Seems like it's physics only, some problem with Impulse applied to objects. Not sure if it's a browser or C2 issue.
Could be that because the browser runs at 120fps, the impulse is applied every frame and this means twice as many times on Chrome which results in faster movement of the physics object.
Also, games run way smoother in Chrome... they seem to jitter in Firefox even when running at 60fps. Do we know why?