Public bug reported:

Ubuntu version:  Kubuntu 17.04
Firefox version: 53.0.3+build1-0ubuntu0.17.04.2

In Firefox, two-finger scroll gestures on a touchpad are interpreted as
scroll wheel rotations, and the content scrolls three lines at a time.
This is inappropriate behavior for touchpad scrolling; it should scroll
pixel-by-pixel.

Firefox already has the ability to do this, you just need to turn it on
by running the program with MOZ_USE_XINPUT2=1 in the environment: for
example, by running `MOZ_USE_XINPUT2=1 firefox`, or adding it to
/etc/environment or something like that.

Turning on this behavior yields a large usability improvement for laptop
users. Therefore, I am proposing that MOZ_USE_XINPUT2=1 be permanently
added to the packaging such that it's always present when Firefox runs.
This is what Fedora does, and it results in a much improved experience
for the laptop user.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1697122

Title:
  Package Firefox with MOZ_USE_XINPUT2=1 in environment

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