Preconditions:
signon.management.page.enabled is True

Affected versions:

• Latest Nightly 69.0a1 (2019-06-04) (64-bit)
• Latest Beta 68.0b7 (64-bit)

Affected Platforms:

• Ubuntu 18.04

Steps to reproduce:

• Launch Firefox and enable the prefs
• Go to about:logins
• Create new entries until the list becomes scrollable
• Hover over the scrollbar and scroll the entries list

Expected result:

• The gap between the scrollbar and the header is too large - when the scrollbar is not hovered over

Actual result:

• The distance between the scrollbar and the header could be improved as the gap between the mentioned elements is too big when the scrollbar is not focused
• Scrolling the bar to the bottom will leave a blank space in the upper corner. <- This could be polished for Linux system.
  Screenshots:
• https://imgur.com/a/a69xM7m
• https://imgur.com/a/DoEqKTK

Mass move to about:logins

As of Nightly 99 the scrollbar starts under the header and the problem does not exists.