This sounds like this upstream bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1658106.
Can you please comment there with your version and any relevant details?
** Bug watch added: Mozilla Bugzilla #1658106
https://bugzilla.mozilla.org/show_bug.cgi?id=1658106
** Also affects: firefox via
Additional information/research:
In the "manage bookmarks" window, it appears to work fine to move the
items to the positions i want them to be.
Most of the time this works as expected, but sometimes they dont land
exactly where I placed them (as indicated by the line that appears as
soon as they
