I have artifacts on Youtube videos in Firefox.

I use a Raspberry Pi 4, and now I have artifacts on Youtube videos in Firefox after update. Ubuntu 20.10, Firefox 89.0+build2-0ubuntu0.20.10.1 arm64

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: firefox 89.0+build2-0ubuntu0.20.10.1
ProcVersionSignature: Ubuntu 5.8.0-1026.29-raspi 5.8.18
Uname: Linux 5.8.0-1026-raspi aarch64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu50.7
Architecture: arm64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: daniel 1398 F.... pulseaudio
 /dev/snd/pcmC1D0p: daniel 1398 F...m pulseaudio
 /dev/snd/controlC0: daniel 1398 F.... pulseaudio
BuildID: 20210527174632
CasperMD5CheckResult: skip
Channel: Unavailable
Date: Thu Jun 10 07:55:19 2021
ForcedLayersAccel: False
ImageMediaBuild: 20201022
IpRoute:
 default via 192.168.1.1 dev eth0 proto dhcp metric 100
 default via 192.168.1.1 dev wlan0 proto dhcp metric 600
 169.254.0.0/16 dev eth0 scope link metric 1000
 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.113 metric 100
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.114 metric 600
NoProfiles: True
PciNetwork:

PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RunningIncompatibleAddons: False
SourcePackage: firefox
UpgradeStatus: No upgrade log present (probably fresh install)