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:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• Anti-Rootkit Utility - TDSSKiller
• AdwCleaner (for more info, see this alternate AdwCleaner download page)
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one. Windows 8 has antivirus built-in already.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

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No,I thank you .I tried every malware and there were no problems.I cannot fix it

 Thank you for trying

What does the popup say -- is it from the game, or some kind of alert from Firefox, or a crash dialog from Windows, or an ad from somewhere else?

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

• Use a compressed image type like PNG or JPG to save the screenshot
• Make sure that you do not exceed the maximum size of 1 MB

It seems to be from pogo.The latest word is that Java sent all of us a newer version 8U 51 and it is not compatible with Mozilla Firefox

xjules7 said

It seems to be from pogo.The latest word is that Java sent all of us a newer version 8U 51 and it is not compatible with Mozilla Firefox

On Windows 7, I have Java 8 U60. If you still have U51, you could try updating. It might be easiest to do that from the Windows Vista Control Panel, you should find "Java (32-bit)" in there, perhaps in the Programs category. It opens a dialog with an Update tab and there is an Update Now button.

Or is Java 8 U60 the problem version?