This is probably the same bug as the one I submitted against mutter:

https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1810126

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https://bugs.launchpad.net/bugs/1775637

Title:
  Screen tearing both in scrolling and videos

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  Using firefox on the 18.04 default session (gnome-shell on Xorg) I get
  screen tearing when scrolling and also in videos. It's evident in this
  video for example:

  https://www.youtube.com/watch?v=9hIRq5HTh5s

  Where the lines between white and black areas seem to jump around and
  that's not visible in a screenshot.

  When scrolling it's common to see horizontal discontinuities in the
  text.

  Here's the details of my graphics card:

  00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07) 
(prog-if 00 [VGA controller])
        Subsystem: Lenovo Skylake GT2 [HD Graphics 520]
        Flags: bus master, fast devsel, latency 0, IRQ 126
        Memory at f0000000 (64-bit, non-prefetchable) [size=16M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at e000 [size=64]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

  I'm using a Lenovo T460s

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: firefox 60.0.1+build2-0ubuntu0.18.04.1
  ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
  Uname: Linux 4.15.0-22-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.9-0ubuntu7.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   pedrocr    1619 F...m pulseaudio
   /dev/snd/controlC0:  pedrocr    1619 F.... pulseaudio
  BuildID: 20180517114003
  Channel: Unavailable
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun  7 15:35:20 2018
  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 2018-05-31 (7 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  IpRoute:
   default via 10.120.200.1 dev wlp4s0 proto dhcp metric 600 
   10.23.69.0/24 dev tun0 proto kernel scope link src 10.23.69.103 
   10.120.200.0/22 dev wlp4s0 proto kernel scope link src 10.120.202.17 metric 
600 
   169.254.0.0/16 dev wlp4s0 scope link metric 1000
  Locales: extensions.sqlite corrupt or missing
  MostRecentCrashID: bp-eee55497-e2e4-4c82-a862-236a81180223
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=60.0.1/20180517114003 (In use)
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  SubmittedCrashIDs:
   bp-eee55497-e2e4-4c82-a862-236a81180223
   bp-db2b7d55-dbe6-47a3-b50d-e9b691171230
   bp-280d460e-d837-442d-8543-17f3c1171202
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/22/2018
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1CET66W (1.34 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FAS5TS00
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrN1CET66W(1.34):bd03/22/2018:svnLENOVO:pn20FAS5TS00:pvrThinkPadT460s:rvnLENOVO:rn20FAS5TS00:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T460s
  dmi.product.name: 20FAS5TS00
  dmi.product.version: ThinkPad T460s
  dmi.sys.vendor: LENOVO

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