Errors with YouTube

[EE]

Starting yesterday evening, I suddenly got only an error message when I 
tried to play YouTube videos.  The message was something about the 
connection not working, and try again later.  I had the same thing with 
Pale Moon.  After blocking an external javascript called "tampering.js", 
the videos were fine again.  Has YouTube done something with its 
interface to try to block certain browsers?  I had no problem with 
Vivaldi, Slimjet, or Safari.
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