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Firefox 17 for Linux 64-bit: NS_ERROR_XPC_BAD_CONVERT_JS: Could not convert JavaScript argument arg 0 [nsIDOMCanvasRenderingContext2D.fillStyle] @ http://hellorun.helloenjoy.com/js/hellorun.min.js:4

You might want to check your update button. The current version is Firefox 23.0.1.

Sounds like he's on debian, which only uses the ESR release by default

I had similar problems with WebGL on Firefox (Ubuntu) that went away when I upgraded to 23.

I don't have root on this system, and installing Firefox without root is such a pain I haven't gotten around to it.

Your browser is 288 days out of date.