Some external process seems to be changing your Firefox shortcut.

Many users have reported that malware has modified the shortcut to add a web address to it. This causes an advertising or other page to load at startup.

However, I have not heard of what you're describing.

There are some security and utility products that attempt to protect you from changes in your browser settings. These may go by the name "Surfing protection", "browser protection" or "home page" protection, and are included in products such as Advanced SystemCare and some security suites. You might check whether one of those could be rolling back your change.

And I think some supplemental security scans also would be a good idea. This article lists tools that other Firefox users have found helpful: Troubleshoot Firefox issues caused by 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:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• 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!

Which security software (firewall, anti-virus) do you have?

Thank you everyone for all of the information! The anti-virus software on the machine is Symantec Cloud endpoint protection. Which has not reported any sort of incidents with the last scan occurring 3 hours ago. This machine is also sitting on an internal network behind a WatchGuard Firewall XTM5 series device.

Have you done any mall-ware scans? You should use several of them because one might miss something that another may pick up.