Same FF version on win8.1: My car goes full throttle + full turn to the right. Have not yet managed to jump straight (and I can only play Druidia, Road 3).
It works on Chrome on the same computer.
Update: Well, it worked once on Chrome. The next time around the car constantly jumps. Easier to control than full throttle, but not by much.
I had the Win10 preview on a spare laptop that I just use for Netflix and Pandora, and was planning on just upgrading it to full 10..... until all this came out. Wiped it and installed Xubuntu.
I did like Windows 10 though, but then they kinda ruined it
Because the leak may not end up being really accurate; when the contribution is done for cash and not out of care for public well-being, then all bets are off.
(looking for the tweet)