Ban in firefox

[Primarygun]

I pressed the wrong key and allowed a advertisement window to come out every time when I browse the web site. Now, I want to block it again as it makes me very troublesome. I can't figure out how to solve it. Can anyone tell me?

[Dak]

in the tools menu, select options. click web features, and then click 'allowed sites' next to where it says 'block popup windows'.

 

now, select the site that you do not wish to recieve pop-ups from, and click 'remove site'.

[Primarygun]

Thank you.