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Why does Firefox not block all popups? Example Netflicks

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I was on HGTV site and when I closed Firefox, on my desktop was a Netflicks ad.

I was on HGTV site and when I closed Firefox, on my desktop was a Netflicks ad.

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See this: http://kb.mozillazine.org/Popups_not_blocked

IIRC, Netflix uses this service - http://www.optmd.com/
You can use the CLICK TO OPT OUT » link on the right-side of that page to "opt out" of receiving those popunder advertisements.