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The non-standard `mozFillRule` has been removed in Firefox 51 [1, 2]. Instead, a parameter of the standard methods should be used. Note that this is supported in all major browsers for a long time now, so there should be no need keeping this Firefox-specific code around. [1] https://developer.mozilla.org/en-US/Firefox/Releases/51 [2] https://bugzilla.mozilla.org/show_bug.cgi?id=826619