I am seeing this as well in OpenSUSE Tumbleweed having `GDK_BACKEND=wayland` on 
a Lenovo Thinkpad X1 Yoga 3rd gen:
```
00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v6/7th Gen Core 
Processor Host Bridge/DRAM Registers [8086:5914] (rev 08)
00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics 620 
[8086:5917] (rev 07)
```
Software:
- kwin 5.19.2
- Mozilla Firefox 78.0.1

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1838965

Title:
  Screen tearing in Firefox on Wayland

Status in Mozilla Firefox:
  Invalid
Status in firefox package in Ubuntu:
  New

Bug description:
  Details here: https://photos.app.goo.gl/9kA7R6KqNaSsn9CB8

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: firefox 68.0.1+build1-0ubuntu2
  ProcVersionSignature: Ubuntu 5.2.0-8.9-generic 5.2.0
  Uname: Linux 5.2.0-8-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  BuildID: 20190719083815
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Aug  5 13:36:32 2019
  DefaultProfileExtensions: extensions.sqlite corrupt or missing
  DefaultProfileIncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  DefaultProfileLocales: extensions.sqlite corrupt or missing
  DefaultProfilePrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:1141
  DefaultProfileThemes: extensions.sqlite corrupt or missing
  InstallationDate: Installed on 2019-08-04 (0 days ago)
  InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Alpha amd64 (20190802)
  Profiles:
   Profile1 (Default) - LastVersion=None/None (Out of date)
   Profile0 - LastVersion=68.0.1/20190719083815 (In use)
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)

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