How do I prevent "are you sure?" pop-up when trying to exit a web page?

The "are you sure you want to leave this page?" pop up whenever I try to exit a web page is driving me crazy. There must be a way to prevent it but I've found no solution. One reply to the forum called it the "onbeforeclose" and suggested it might be eliminated in the "about:config" part of Firefox, but searching "about:config" I found no such entry. What can be done to stop this highly irritating pop up and prevent it from ever appearing again?

My problem is that none of the suggestions other than completely shutting off JAVA will stop the problem.
It is very annoying to go to a site and try to leave, and even try closing the browser and not be allowed to due to a running script.
The only way I have found out of it is to unplug the internet connection, and restart the computer. When I get the prompt about oops etc about not knowing what to do either go back to the site that gave me the problems or start over. I start over, then connect the internet.
I and others should not need to go though this with ransomeware such as the FBI attack that says it will unlock your system for $200. Or the numerous infomercials that also will no let me and many others go. This problem is also in Internet Explorer, and a few other browsers.
What does it take to keep these scripts from allowing people to leave a page or close the browser? Me and many more want to know, and because the problem exists I have OPERA as a backup browser as it does not get hijacked, but it does not have the ability to have the features and add ons that are available for FireFox.

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What it boils down to is a matter of ethics, and it's wrong. But the web
techies build this feature into their sites because they know somebody
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See if this is of any use for you
http://stackoverflow.com/questions/1119289/how-to-show-the-are-you-sure-you-want-to-navigate-away-from-this-page-when-ch?rq=1
Steven Andrews
SharePoint Business Analyst: LiveNation Entertainment
Blog: baron72.wordpress.com
Twitter: Follow @backpackerd00d
My Wiki Articles:
CodePlex Corner Series
Please remember to mark your question as "answered" if this solves (or helps) your problem.

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Thank you Troy for your Helpful Threads.
Problem Solution:
Followed the thread on How to download and change AFP Masthead on SAP Portal 7.3
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How do I prevent "are you sure?" pop-up when trying to exit a web page?

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