It's a fresh install and that's enabled. Let's be clear here: there is pinch to zoom. But it's an extremely half-assed implementation that is most certainly NOT native and feels terrible. I like Firefox but this has been a deal breaker for me for literally years. I don't understand why their zooming and scrolling can be so good on Android but so awful in Windows.

When you pinch does it jump between zoom levels in large increments or is it smooth? The large jumping was the old behavior – check about:config's browser.gesture.pinch settings are all empty and not mapped to ctrl+ or anything. I haven't tried on Windows but on macOS the native zoom is smooth and pretty good

As a last ditch attempt you could try https://addons.mozilla.org/en-GB/firefox/addon/multi-touch-z...

But if that doesn't work it may hint that pinch gestures aren't being passed to firefox properly; try pinch zooming on maps.google.com, if that doesn't work then maybe there's a deeper issue going on

It no longer jumps in big increments but it's still janky and very much non-native.

Why do you mean by non-native?

If it's janky it might "just" be a performance issue. If you could grab a profile from profiler.firefox.com that would be much appreciated

By non-native I mean non-native. I am definitely not going to do that, I will simply keep using Edge.

I'm really struggling to understand what you mean by "non-native" other than "different to edge". But even that's not useful: different how? Too fast, too slow, too sensitive, not sensitive enough?