Wow, someone even more devoted to blocking ads than I am. Personally I will just never go back to youtube rather than go through that much debugging.
The one time my combination of ublock origin, jshelter, noscript set to allow only the scripts that are actually needed, and custom firefox librewolf settings was insufficient to watch youtube I didn’t go back for a few days. When I did it was mysteriously back to working.
It’s nice to have ntsync, I’ve been using it for a few weeks. Knowing that the thread sync api is solid means one less thing to worry about when debugging modded skyrim.