Trying to trouble something. Does anyone recognize this box with the cross and can tell me where it’s coming from?

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I’ve tried deactivating all the add-ons, to no avail.

Usually it hides beneath the page, only visible when I scroll below the page on my Mac. Though it pops up over the text when I try to print the page.

I’m trying to get rid of it, but cannot figure out what it is.

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