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How do I stop extra instances of Firefox program being opened by another page when it loads?

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How do I stop extra instances of Firefox program being opened by another page when it loads? When I log on to a favorite site it loads OK. The site has a number of pages. When I move to the second or third page, a second instance of Firefox automatically starts and loads an advertisement. I can block the site that tries to load the page, but I cannot stop the second instance of Firefox from loading up. So in the end I might have three or four instances of Firefox all going at once. Any help would be greatly appreciated.

How do I stop extra instances of Firefox program being opened by another page when it loads? When I log on to a favorite site it loads OK. The site has a number of pages. When I move to the second or third page, a second instance of Firefox automatically starts and loads an advertisement. I can block the site that tries to load the page, but I cannot stop the second instance of Firefox from loading up. So in the end I might have three or four instances of Firefox all going at once. Any help would be greatly appreciated.

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Do you have the Popup Blocker turned on? https://support.mozilla.com/en-US/kb/Pop-up+blocker

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Yes, popup blocker is turned on and functioning correctly. This is not a popup, of course, but a complete new instance of Firefox. Thanks anyway.

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Do a malware check with a few malware scan programs.
You need to use all programs because each detects different malware.
Make sure that you update each program to get the latest version of the database.

See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and What to do when searches take you to the wrong search website