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I guess the setter/getter issue is input related because inputs are very strange in Mozilla. They use XBL in some way and this might have higher precedence than the __defineGetter__. Try using __lookupGetter__ and see what it says.|
You could also try using a mutation event for the attribute but remember that attributes are not the same as properties so setting disabled might not trigger the attribute change mutation event (although it should).
Mozilla is having trouble with symbol fonts
The sinus path should still look alright in Moz.