Created attachment 1206959 [details]
Screenshot of the Firefox Library dialog without content.

Description of problem:

In Firefox, pressing CTRL+SHIFT+O should show the Library dialog at the Bookmarks section. All bookmarks should be shown. CTRL+SHIFT+Y should show the Library dialog at the Downloads section with a list of recent downloads. Instead, opening the Library dialog just shows the dialog with empty content.

Version-Release number of selected component (if applicable):

$ cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 7.2 (Maipo)

$ rpm -qi firefox
Name        : firefox
Version     : 45.4.0
Release     : 1.el7_2
Architecture: x86_64
Install Date: Tue 27 Sep 2016 05:00:25 PM EDT
Group       : Applications/Internet
Size        : 149414176
License     : MPLv1.1 or GPLv2+ or LGPLv2+
Signature   : RSA/SHA256, Thu 08 Sep 2016 09:54:32 PM EDT, Key ID 199e2f91fd431d51
Source RPM  : firefox-45.4.0-1.el7_2.src.rpm
Build Date  : Wed 07 Sep 2016 07:25:07 AM EDT
Build Host  : x86-030.build.eng.bos.redhat.com
Relocations : (not relocatable)
Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
Vendor      : Red Hat, Inc.
URL         : http://www.mozilla.org/projects/firefox/
Summary     : Mozilla Firefox Web browser
Description :
Mozilla Firefox is an open-source web browser, designed for standards
compliance, performance and portability.

How reproducible:

This behavior is consistent for all attempts to view the Library dialog. It just started during today's session. I have not tested to see if the behavior persists between Firefox sessions.

Steps to Reproduce:
1. In Firefox press CTRL+SHIFT+O
2. Observe that the Library dialog opens
3. Observe that the Library dialog does not display any content

Actual results:

No content in the Firefox Library dialog

Expected results:

Bookmarks, download history, and other content should display

Additional info:

This is general usability issue.