We need to see the whole message. If you know how, open the Norton control panel and look thru its history.

What is the web page causing the trouble? Did you go there by choice? Was it a pop-up?

Here is a screen shot of the Norton details on the intrusion. I also noticed that on a couple of occasions when I went back to my browser window, another window was open with a strange URL in it, I believe it was the same as that noted in the Norton screenshot. To answer your question, no, I did not go there by choice, and it was not a popup.

Here is a screenshot of some recent Firefox browsing history, showing the url of concern

Norton recognized something bad was coming in and blocked it. You don't need to worry about that too much. How or when did that page open? You may have bad programs on your system

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.

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

Did this fix your problems? Please report back to us!

The lpmxpnumber domains seem to be associated with a wide range of malware.

Here are some suggestions for clean up.

Open the Windows Control Panel, Uninstall a Program. After the list loads, click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help in smoking out undisclosed bundle items that snuck in with some software you agreed to install. Take out as much trash as possible here.

Then, in Firefox, open the Add-ons page using either:

• Ctrl+Shift+a
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Extensions. Then, if in doubt, disable (or Remove, if possible) unrecognized and unwanted extensions.

Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.

Finally, you can "mop up" remaining issues with the scanning/cleaning tools suggested in this support article: Troubleshoot Firefox issues caused by malware. This may be the same list FredMcD already posted.

Success?

I agree that this is likely either malware on computer trying to connect to the site or it is a Extension doing this.

Mozilla nor the Firefox browser would be doing this.

Thanks. I was thinking that maybe Firefox has some sort of vulnerability. I've had the same problem with Chrome in the past, where weird extensions are added to the software and cause your computer to do weird things.

Thank you. I have not found any unwanted programs or extensions. I will run an adware cleaner as per your suggestion.