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Random YouTube page update - high-definition add-onn is not installed

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I have come across this answer as to why youtube page gets randomly updated: https://support.mozilla.org/en-US/questions/1246764#question-reply

After checking all my settings, I couldn't find any add on or extension containing "high-definition" words in it. My only extention in firefox is ublock origin.

Any idea why the updates continue to take place? Can ublock origin cause it? Or has there been a browser update that could cause it?

Many thanks in advance,

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