[Bug 1635103] [NEW] Firefox has black glitches on screen on Wordpress wp-admin and other sites.

[NoBugs!]

Public bug reported:

Go to a Wordpress site wp-admin, edit a page, notice when the left bar
slides away it leaves a black bar. I've seen a similar glitch on a
Twitter page with top bar sliding out but I can't seem to find it again.

Please see screenshot.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: firefox 49.0+build4-0ubuntu0.14.04.1
ProcVersionSignature: Ubuntu 4.4.0-42.62~14.04.1-generic 4.4.21
Uname: Linux 4.4.0-42-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  luke       5485 F.... pulseaudio
BuildID: 20160919213721
Channel: Unavailable
Date: Wed Oct 19 19:54:59 2016
DefaultProfileIncompatibleExtensions: Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
DefaultProfilePrefSources:
 prefs.js
 [HomeDir]/moz/DevTools-Tweaks/defaults/preferences/defaults.js
EcryptfsInUse: Yes
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-11-23 (1061 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
IpRoute:
 default via 192.168.0.1 dev wlan0  proto static 
 192.168.0.0/24 dev wlan0  proto kernel  scope link  src 192.168.0.12  metric 9 
 192.168.122.0/24 dev virbr0  proto kernel  scope link  src 192.168.122.1
ProcEnviron:
 LANGUAGE=en_US
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Profile1Extensions: extensions.sqlite corrupt or missing
Profile1IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile1Locales: extensions.sqlite corrupt or missing
Profile1PrefSources: prefs.js
Profile1Themes: extensions.sqlite corrupt or missing
Profile2Extensions: extensions.sqlite corrupt or missing
Profile2IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
Profile2Locales: extensions.sqlite corrupt or missing
Profile2PrefSources:
 prefs.js
 [Profile]/extensions/devtooltweaks at Luke.Bryan/defaults/preferences/defaults.js
Profile2Themes: extensions.sqlite corrupt or missing
Profiles:
 Profile0 (Default) - LastVersion=49.0/20160919213721 (In use)
 Profile1 - LastVersion=33.0/20141007221017 (Out of date)
 Profile2 - LastVersion=50.0a2/20160818004001 (Out of date)
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 totem-mozilla     3.10.1-1ubuntu4
 rhythmbox-mozilla 3.0.2-0ubuntu2
 gnome-shell       3.10.4-0ubuntu5.2
 icedtea-7-plugin  1.5.3-0ubuntu0.14.04.1
 google-talkplugin 5.41.3.0-1
RunningIncompatibleAddons: True
SourcePackage: firefox
SystemImageInfo: Error: [Errno 2] No such file or directory: 'system-image-cli'
UpgradeStatus: Upgraded to trusty on 2014-04-19 (914 days ago)
dmi.bios.date: 12/17/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A16
dmi.board.name: 0C5Y96
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A16
dmi.modalias: dmi:bvnDellInc.:bvrA16:bd12/17/2013:svnDellInc.:pnXPSL521X:pvrA16:rvnDellInc.:rn0C5Y96:rvrA00:cvnDellInc.:ct8:cvrA16:
dmi.product.name: XPS L521X
dmi.product.version: A16
dmi.sys.vendor: Dell Inc.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

** Attachment added: "Screenshot"
   https://bugs.launchpad.net/bugs/1635103/+attachment/4764021/+files/goofyshow.png

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Title:
  Firefox has black glitches on screen on Wordpress wp-admin and other
  sites.

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