The sound adjustments are not persistent from one video to the next. You have to fiddle with all three sliders for each YouTube video. Otherwise it works as expected, but for now I am using a different extension which isn't so needy for attention.
@passenger-chi Buy a VPN, the only 100% secure is NordVPN: Sweden only country who has Privacy as NR1 in law, So not even judge can demand your IPadres, or whatever.....