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For reference and completeness, works in Chrome.

Refreshing it seems to fix it

Tried that - didn't fix it.

I have now watched it on my phone and it's amazing. I'm just a little put out that it doesn't work on my up-to-date install of Firefox on my up-to-date install of Ubuntu.

Is there a version of Linux that really does "just work" ?

Try clicking on the image.

I did - it doesn't.