Affected in Firefox 70 (64-Bit) on Ubuntu 18.04.3.

** Tags added: bionic

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https://bugs.launchpad.net/bugs/1730903

Title:
  Firefox has screen tearing on Intel Graphics with default setting

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  Firefox has choppy scrolling/tearing on pretty much any web page with
  the default settings on Intel Graphics. Since the modesetting driver
  uses OpenGL, you have to force enable layers.acceleration
  (layers.acceleration.force-enabled) in about:config to remedy this.
  The other thing that works is to enable the Intel DDX driver with
  TearFree.

  This is on a fresh Ubuntu 17.10 install in the Xorg session but the
  same would apply to Wayland as well as Xwayland also uses the
  modesetting driver.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: firefox 56.0+build6-0ubuntu1
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.7-0ubuntu3.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0p:   prashant   1605 F...m pulseaudio
   /dev/snd/controlC1:  prashant   1605 F.... pulseaudio
   /dev/snd/controlC0:  prashant   1605 F.... pulseaudio
  BuildID: 20171003222101
  Channel: Unavailable
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Nov  8 13:36:53 2017
  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 2017-11-03 (4 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  IpRoute:
   default via 192.168.1.1 dev wlp6s0 proto static metric 600 
   192.168.1.0/24 dev wlp6s0 proto kernel scope link src 192.168.1.101 metric 
600
  Locales: extensions.sqlite corrupt or missing
  PrefSources: prefs.js
  ProcEnviron:
   LANGUAGE=en_IN:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_IN
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=56.0/20171003222101
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/15/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 05JF1T
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA04:bd10/15/2015:svnDellInc.:pnVostro3558:pvr01:rvnDellInc.:rn05JF1T:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Vostro 3558
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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