Add invidious
invidio.us or its instances provide a way to watch youtube videos without communicating with youtube servers. By default only googlevideo is contacted but its also possible to avoid this by setting the proxy option in the settings.
It works perfectly.
EDIT: There is also a very nice firefox addon which redirects all youtube sites to an invidious instance (the instance can be set in the addon settings)
Edited by Merkel12