Youtube videos on safer produce error in 10.0a5

Instead of playing the video, the following message is shown:

An error occurred. Please try again later. (Playback ID: fd-mqZ59PTD71txh)
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The following error is logged

JavaScript error: moz-extension://372e0e08-1f07-49be-b2cf-b74b5be0f081/content/media.js, line 62: Error: audio/webm; codecs="opus" (MSE) blocked by NoScript

The webconsole doesn't contain any useful information.

Edited Aug 20, 2020 by Georg Koppen

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information