Just wanted to clarify, Volume Master does work on YouTube, but it's capped at 600% (if you choose max volume on YouTube) due to a browser-level limitation that no extension can bypass. If you're not hearing any increase at all, try refreshing the page after installing the extension and then adjusting the slider. Hope that helps!

Thanks, I appreciate it :)
If it doesn't work on certain websites or you find any bugs, let me know and I will try to fix it.