@fvsch So, as I said... using -moz-appearance:none leaves the checkboxes invisible so I am not sure why it worked for you (see screenshots in try run). You didn't see to want to use the SVG checkboxes under Windows and Linux so what would you like us to do?
Bug 1491811 Comment 35 Edit History
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We are now using `-moz-appearance:none` to apply the SVG checkboxes under Windows and Linux and using the native checkboxes on OSX.