Does anyone know what this transparent box thing in my browser is? Appears on Chrome & Brave. Only on some pages, not all.

It's like transparent layer or something like that. When it's there I'm having issues selecting text.

I've cleared cache & cookies. Ran Malwarebytes. Restated my Mac. 

Still there. 🤷‍♂️

I'm completely clueless as to what that is. Just appeared today out of nowhere.

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Ok, disabling all extensions seems to have done the trick. 

Now to figure out which one it was. 🙄