How do I prevent a website from opening another window

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?

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?

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'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* On Windows you can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac you can open Firefox 4.0+ in Safe Mode by holding the '''option''' key while starting Firefox.
* On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
[[Image:FirefoxSafeMode|width=520]]
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
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How do I prevent a website from opening another window

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