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Embedded videos and Disqus comments no longer appear in Firefox Quantum.

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So I upgraded to Quantum on MacOS and embedded YouTube videos are not appearing. Now the embedded video linked in the reply to this question ( appears, but on sites ranging from to, there is just blank space where there should be an embedded video. This is a major problem as it can be near-impossible for the average user to work out what video was embedded. Now, I am able to go into the page source and locate the embedded video, but this should not be necessary.

Further, pages on sites that use Disqus for leaving comments no longer load the Disqus comments. In fact, there is no visual indication that there is a comment section on these pages. I have noticed this on and I don't particularly care about the Disqus comments as they tend to be toxic, being internet comment sections and all, but this is a problem for other users who leave comments on such pages or wish to view comments left by other users.