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"unknown message" warning on every mouse move over an output

Is anyone else seeing this warning in the devtools console. I think the behavior started last week. It’s definitely affecting performance and it’s making debugging difficult because important console messages are being buried by this one:

static.observableusercontent.com/next/worker-67bff934.js:2 unknown message Object
(anonymous) @ static.observableusercontent.com/next/worker-67bff934.js:2

That’s odd, I don’t see that on my win10, chrome machine.
Does that error still happen in incognito mode? Or in a different browser?

Thanks for checking on this, @hellonearthis. I tried incognito and no warnings. I disabled the Browserflow Chrome extension and the warning is gone :+1:

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