I'm on a Mac, and Youtube is working fine.

Now if you mean by "not working" that Opera allows autoplay, then yes that would be a fail.

Does anyone know how to use 1Password with Opera?

what version of Opera are you running, and what version of 1Password are you running, and where did you get the extension?

Yeah I did that. It was a very strange bug.

"WAS?" Did deleting "Local State" fix it?

I'm still not convinced this is a bug. Have you checked your preference region selection?

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I just noticed that this says it's my first post. How that is possible is beyond me. I've posted more than 22,000 comments to the Opera forum in the last decade and half (maybe longer).