That's unfortunate, we moved to godot 4.3 which has so far worked pretty well in web. If you're interested, we could do some troubleshooting but if not thanks for trying!
You could try turning on hardware acceleration on whatever browser you are using, it helped some people with similar issues. I'm not sure about Firefox but in chromium based browsers like Edge, Chrome, and Brave the setting is "Use graphics acceleration when available".
