Public bug reported:

steps to reproduce:

1. open a Firefox window and play Youtube video
2. open a new Firefox window and go to a scrollable page
3. scroll the page

I have a Pentium P6100 with Intel graphics and I don't have Flash
enabled.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 49.0.2+build2-0ubuntu0.16.04.2
ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
Uname: Linux 4.4.0-45-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/pcmC0D0p:   matteo     1652 F...m pulseaudio
 /dev/snd/controlC0:  matteo     1652 F.... pulseaudio
BuildID: 20161025170400
Channel: Unavailable
CurrentDesktop: Unity
Date: Mon Nov  7 16:35:23 2016
ExecutablePath: /usr/lib/firefox/firefox
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 2016-06-14 (145 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IpRoute:
 default via 192.168.1.1 dev wlp2s0  proto static  metric 600 
 169.254.0.0/16 dev wlp2s0  scope link  metric 1000 
 192.168.1.0/24 dev wlp2s0  proto kernel  scope link  src 192.168.1.101  metric 
600
Locales: extensions.sqlite corrupt or missing
Plugins: Shockwave Flash - /usr/lib/adobe-flashplugin/libflashplayer.so 
(adobe-flashplugin)
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=49.0.2/20161025170400 (In use)
RelatedPackageVersions: adobe-flashplugin 1:20161026.1-0ubuntu0.16.04.1
RfKill:
 0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/28/2011
dmi.bios.vendor: INSYDE
dmi.bios.version: 2.00
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnINSYDE:bvr2.00:bd06/28/2011:svnTOSHIBA:pnSatelliteC645:pvrPSC00P-01LLM3:rvnTOSHIBA:rnPortablePC:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.name: Satellite C645
dmi.product.version: PSC00P-01LLM3
dmi.sys.vendor: TOSHIBA

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


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1639957

Title:
  Screen tearing when scrolling if a Youtube video is playing in another
  window

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