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why don't some Mac trackpad controls work in Firefox?
Mac trackpads (at least on my MBA running Sierra) have options for using the trackpad - like pinching or expanding with two fingers to zoom in or out, or smart zoom where you double-tap with two fingers to zoom in. These don't work in Firefox - but I don't see how (or why) a browser should prevent using trackpad gestures that are part of the OS. My FF is up to date.