While upgrading to #Firefox 72 I accidentally reverted from #wayland native firefox to X11 firefox, which means that (because I have a hidpi screen and non-integer scaling) all my fonts are fuzzy. Just switched back and found that I now have kinetic/inertial scrolling too.

Which would be nice, except it takes way too long to slow down after I take my fingers off the touchpad, and the zillion and one things I can tune in about:config don't appear to include #kinetic scrolling friction