The Software Updater says “No additional drivers available”, which is why I used the default open-source AMDGPU drivers. The only proprietary drivers I can find online are the AMDGPU-Pro drivers, but I don’t want to use those since I tried installing them on Ubuntu once, and it kept booting into the GRUB terminal thing (not sure what it was), so I wiped the SSD and installed Zorin OS. All of my Steam games run fine via Proton (which uses Vulkan), and the Google Earth website runs smoothly with almost no lag. The only issues are video playback (it even drops frames at 144p, whereas there are no issues in Firefox even with 4k60fps) and certain WebVR experiments (like the webpage I put in the original post). I had no issues with video playback in Chrome about a week ago. I’ll try uninstalling and reinstalling Chrome to see if that will do anything.