> If your UA is indicating that you have Firefox 66, Youtube could be 
> detecting that and assuming it can use features which are available in 
> that version - and perhaps it would work if you actually used Firefox 
> 66. But since you actually have an older version of Firefox (or 
> SeaMonkey based on an older version of Firefox) those features may not 
> actually be available, so Youtube is trying to use features your browser 
> doesn't support so it doesn't work as it should. When you indicate the 
> version you actually have, perhaps they use older features which are 
> available in that older version, so it works.
> 
> -- 
> Mark.

But that worked two or three weeks ago without problems.
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