Nested bookmark folders go off screen on about:bookmarks

[hippalectryon-0]

Using the Bookmark Manager, nested folders appear next to each other, each child to the right of its parent.

If too many childs are added, this makes a chain that goes out of the computer's screen, and it is thus impossible to access to the latest child.

See the picture attached for a clearer understanding of the issue.

[bsclifton]

Bookmarks Manager recently updated with #4658 (which was followed up by #4690). This is still an open issue

[bsclifton]

Updated #4690 to include a fix for this 😄

[alexwykoff]

In the second image from gauthierhaas we see that the bookmarks toolbar has an issue with nested folders.
Based on the latest build, it would appear that it has not been fixed.

[bsclifton]

Created #4745 to track the bookmarks toolbar issue 😄 This issue is ONLY to track about:bookmarks page (Bookmarks Manager)

[luixxiul]

pinging @bsclifton for triaging the milestone.