I hope they didn't screw it up as bad as Apple did with Safari: http://www.phoboslab.org/log/2012/09/drawing-pixels-is-hard
Edit: judging from some comments in the source, the Canvas element still uses a low resolution, so the test case should work as expected in any case.
(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252), (252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0), (0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252), (252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0), (0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252), (252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0), (0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252), (252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),(252,40,252),(0,0,0),
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:18.0) Gecko/18.0 Firefox/18.0 as downloaded and installed just a few minutes ago.
I hope they didn't screw it up as bad as Apple did with Safari: http://www.phoboslab.org/log/2012/09/drawing-pixels-is-hard
Edit: judging from some comments in the source, the Canvas element still uses a low resolution, so the test case should work as expected in any case.