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why don't some Mac trackpad controls work in Firefox?

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kapakahi
kapakahi
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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.

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.