I have OSX 10.7 Lion I set up a separate email account for my wife.  Now when she tries to enter a website we get the following error message:  Java Script: Not Null validator already loaded.  The website never opens and it is difficult to get out of:

I have OSX 10.7 Lion.  I set up a separate email account for my wife.  All of a sudden when she tries to enter and website from email we get the following error message.  JavaScript;  The notnull validator has already been loaded.  From there we can't seem to go any where.  When you hit OK it just keeps appearing and the only way to get out of it is to quit Safai.  If you try and got directly to Safari you get the same error message and can't go any further.  Please help.

What you are experiencing is 100% related to Malware.
Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
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