It might be that the default for Windows is to sleep rather than do a full shutdown. Whenever Linux looks at a Windows partition it looks corrupted. When windows starts up again it’s inconsistent as some of the data was in the sleep image.

I wonder what made youTube decide to fix this loophole? These days the vast majority of people use phone apps or smart TVs to watch. The number of people using Firefox plus ad blockers must be quite small and it’ll be a constant effort to keep updating their anti ad block algorithms.