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According to MDN, see https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/mozOpaque, the `mozOpaque` canvas-property is not only non-standard (obviously) but it's also been deprecated. Instead it's recommended to use `alpha = false` when getting the canvas-context, see https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext#contextattributes, which all of our affected code is already doing.