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Huh strange mine now shows ##div:nth-of-type(5)
If you look below the text box there should be three options:
Pick: allows you to select a region
Preview: toggles the filter so you can see how it looks
Create: Sets the filter which is what you’ll need after you’ve selected ##div:nth-of-type(5)
Hope that helps C: Alternatively read mode on Firefox gets past it too c;
Reminds me of an interview Gaben did