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How do I prevent a website from opening another window

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A couple of websites I occasionally visit open up a second window to a spam website. I have put an entry in my Hosts file to prevent Firefox from connecting to the spam websites, so the second window is empty. However, it's still a little annoying.

I have pop-up blocking turned on. Is there anyway to completely block the opening of the second window?

If not, why not?

A couple of websites I occasionally visit open up a second window to a spam website. I have put an entry in my Hosts file to prevent Firefox from connecting to the spam websites, so the second window is empty. However, it's still a little annoying. I have pop-up blocking turned on. Is there anyway to completely block the opening of the second window? If not, why not?

Wšykne wótegrona (2)

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Thank you for taking the time to reply. I really do appreciate it.

Unfortunately, the link you posted tells me exactly nothing. My question is "How do I prevent a website from opening unwanted windows". These are full Firefox windows, just like you would get if you right clicked on a link and selected "open in a new window".

There are only two possible answers:

(A) To block unwanted windows, do this ________ (insert answer)

or

(B) It's not possible.

If the answer is (B) then the follow-up question is -- Why Not?