[Bug 1613117] [NEW] Download-complete animated image stays on screen after showing

[Craig]

Public bug reported:

When I download something in Firefox and it completes, the blue arrow
animated image shows and stays over the toolbar indefinitely.  As other
things change (causing parts to rerender) in the affected area, that
portion of the image goes away.

This occurred in FF 47 and now 48 too.

Image attached showing what I'm talking about.  Color is funny in
screenshot due to misconfigured screenshot tool.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 48.0+build2-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  clandry    3969 F.... pulseaudio
 /dev/snd/controlC1:  clandry    3969 F.... pulseaudio
BuildID: 20160728203720
Channel: Unavailable
CurrentDesktop: GNOME-Flashback:Unity
Date: Sun Aug 14 14:57:36 2016
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
InstallationDate: Installed on 2015-08-02 (378 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
IpRoute:
 default via 10.10.10.254 dev wlan0  proto static  metric 600 
 10.10.10.0/24 dev wlan0  proto kernel  scope link  src 10.10.10.219  metric 600 
 169.254.0.0/16 dev wlan0  scope link  metric 1000
Locales: extensions.sqlite corrupt or missing
Plugins:
 iTunes Application Detector - /usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so (rhythmbox-mozilla)
 Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources:
 prefs.js
 [Profile]/extensions/support at lastpass.com/defaults/preferences/defaults.js
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/usr/bin/zsh
Profiles: Profile0 (Default) - LastVersion=48.0/20160728203720 (In use)
RelatedPackageVersions: rhythmbox-mozilla 3.3-1ubuntu7
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to xenial on 2016-06-12 (63 days ago)
dmi.bios.date: 12/11/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A02
dmi.board.name: 0GFTRT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA02:bd12/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: XPS13 9333
dmi.sys.vendor: Dell Inc.

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


** Tags: amd64 apport-bug xenial

** Attachment added: "download-complete.png"
   https://bugs.launchpad.net/bugs/1613117/+attachment/4720895/+files/download-complete.png

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Title:
  Download-complete animated image stays on screen after showing

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