why do some trackpad gestures not work in Firefox?

I'm trying Firefox again to try to get away from Google. As before it's proving to be inconvenient in a lot of ways. Like the trackpad - the 2-finger /spread to zoom out and in doesn't work at all, though it works perfectly in Chrome. Smart zoom (2-finger double-tap) and Rotate (rotate with 2 fingers) also don't work. I can't find any setting in Firefox to fix this and nobody in the FF community has responded to my questions. Is anybody here familiar with this in FF and know how to make it work? Many thanks.