This was not a Firefox update, but a piece of malicious software you have inadvertently downloaded from a site called http://ffftp.co.cc/ which is impersonating Firefox. I discovered this as soon as my Zonealarm requested permission for "Golds" to access the internet. Golds??!! However I couldn't find a file with this name installed on my computer.

You should delete the file you downloaded and certainly do not allow internet access to any suspicious program. If you have already given permission, scan your PC immediately for any virus, malware, etc. Best of luck.

Thanks for that. How do you know it was malware? I had clicked "allow once", and have since done a full scan and nothing can be found by McAfee, but I get the warning up every time I use Firefox. If I ignore it everything else keeps running fine, but I would like to find and solve whatever the problem is. Thanks again.