Same on Firefox 44.0.2 on Win7

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.

same version of FF on win8.1 has no issues

Same on my Windows 7, Firefox and Chrome. Strange that it seems to happen on all kinds of setups.

Firefox 46.0a2 (2016-03-02) on Arch Linux, Intel Graphics. Runs very well.

same