Install Intel GPU Drivers (Ubuntu 22.04):
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*This is needed for most web browsers:

For Intel Gen 8+ hardware:
sudo apt install intel-media-va-driver-non-free libva-drm2 libva-x11-2 vainfo intel-gpu-tools

For Intel Gen 7 and earlier hardware:
sudo apt install i965-va-driver-shaders libva-drm2 libva-x11-2 vainfo intel-gpu-tools

Sources:
https://www.linuxuprising.com/2021/01/how-to-enable-hardware-accelerated.html
https://ubuntuhandbook.org/index.php/2021/08/enable-hardware-video-acceleration-va-api-for-firefox-in-ubuntu-20-04-18-04-higher/

Date in Vivaldi: March 20th 2021 to November 13th 2021