When trying to scroll in Firefox using my trackpad, I end up accidentally changing the page's zoom level.
On other OSes you can disable pinch-to-zoom by going to about:config and blanking out browser.gesture.pinch.in and browser.gesture.pinch.out, but that solution doesn't work on Windows 10.
How does one disable pinch-to-zoom in Firefox on Windows?
11 Answer
This can be done from Windows 10 settings app. After disabling browser.gesture.pinch.in and browser.gesture.pinch.out from about:config, go to Settings > Devices > Touchpad and uncheck 'Pinch to zoom' option. Note that this may also disable pinch to zoom feature for the other applications.
You can also simply use Ctrl+Scroll to zoom in-out in web pages instead of using pinch to zoom.