1384325 - putting library in the overflow menu and selecting bookmarks breaks the menu for several seconds

Status: RESOLVED DUPLICATE of bug 1382918

(Firefox :: Toolbars and Customization, defect)

Description

[Asa Dotzler [:asa]]

If you put the Library in the Overflow menu and then select library -> bookmarks (with a very lage bookmarks list) it breaks the overflow menu. The menu hangs for a while, flashes, and disappears. 

Steps to reproduce:
1. Menu -> Customization
2. Add Library to the overflow menu
3. Click overflow menu -> library -> bookmarks

Results: menu breaks

Expected results: menu works. 

Tested on WIn7 and Win10 nightly builds with large number of bookmarks. Works fine if you have a new profile with just a few bookmarks but fails with a large number of bookmarks.

Comment 1

[Asa Dotzler [:asa]]

OK. It doesn't completely fail; it just takes a long time to show the bookmarks and part of the menu disappears while it's waiting. Some of the time it causes the content area to repaint.

Comment 2

[Asa Dotzler [:asa]]

The library -> bookmarks transition is much faster less janky in the hamburger menu.

Comment 3

[Asa Dotzler [:asa]]

Here's a video of it with the very long pause after clicking Bookmarks before the menu is briefly truncated and then restored with bookmarks. https://youtu.be/ziaW1ZexLO0

Comment 4

[Asa Dotzler [:asa]]

History does the same thing as Bookmarks. It hangs the menu for many seconds before filling in.