Over-scroll was backed out due to performance issues¹, the bug² number for the future implementation of it is 939480. 1: https://bugzilla.mozilla.org/show_bug.

Over-scroll was backed out due to performance issues¹, the bug² number for the future implementation of it is 939480. 1: https://bugzilla.mozilla.org/show_bug.cgi?id=946862 https://bugzilla.mozilla.org/show_bug.cgi?id=946862 2: https://bugzilla.mozilla.org/show_bug.cgi?id=939480 https://bugzilla.mozilla.org/show_bug.cgi?id=939480