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Comment by lonk | Hacker News Reader

Scrolling is still jerky and sluggish on android.

Firefox for Android will be copying Chrome's scrolling physics for faster scrolling, since that's what Android users are used to. Chrome doesn't use Android's standard scrolling physics, so custom scrolling code is needed to emulate its behavior.

You can test this in Firefox 61 Beta by setting the "apz.android.chrome_fling_physics.enabled" pref to true in about:config. The new behavior will hopefully be enabled by default in Firefox 62.

https://bugzilla.mozilla.org/show_bug.cgi?id=1448439

Ah, I was wondering why my scrolling was getting "fling"ed so much on Nightly. It's kinda unusable because 2/3 of the time, when I lift my thumb off the screen, it gets interpreted as a fling. Maybe I'll get used to being very careful, but for now I'm glad to know there's a toggle.

There are still fling bugs to be fixed. :) Feel free to file a bug in Bugzilla that blocks bug 1448439. Perhaps you are seeing one of these known bugs:

* Weirdness at end of Fennec fling. Don't send duplicate DOM 'scroll' event for sub-pixel scrolling: https://bugzilla.mozilla.org/show_bug.cgi?id=1230176

* Scrolling in Android has a distinct hitch when releasing finger: https://bugzilla.mozilla.org/show_bug.cgi?id=1425739

You can also tweak the fling physics parameters with these about:config prefs:

  apz.android.chrome_fling_physics.friction
  apz.android.chrome_fling_physics.inflexion
  apz.android.chrome_fling_physics.stop_threshold

Thanks, I had noticed the behavior in 1425739 but assumed it was because of my bulky screen protector.

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