Question ~200FPS drop from editor to WebGL. VSync stays active after disable

My game gets ~200FPS in the editor, then after I build it, it gets less than 15 in the browser. In profiler, the problem seems to be the CPU, with 70-80% of the load coming form 'VSync'. In Player Settings, VSync is set to 'Don't Sync' for every quality level. When I run Task Manager, CPU use is only around 15% with some peaking at 20%+. I've gone through and reduced the texture sizes, the game is now around 600KB in size but this did nothing. I've read any documentation I could find and it hasn't improved. I've also checked for help threads all day yesterday and got nothing.

My setup is Unity 2020.3.0f1, Windows 7 64-bit. Firefox 86. I've played other Unity WebGL games and they run fine. I am basically a noob so hopefully I'm doing something dumb that can be easily fixed.

 

Hardware acceleration disabled?
https://www.clonefileschecker.com/b...-Hardware-Acceleration-in-Mozilla-Firefox.png

 

Thanks for the reply. Hardware acceleration is already on by default.

 

Have you tried a mobile build like Android?

 

It seems this issue is with Firefox. I tried it with Opera on a whim and it runs fine. It targets to 60fps which I don't remember setting but I didn't look into it as 60fps is enough.