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 firewall 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 do not allow internet access to any suspicious program. You should also scan your PC immediately for any virus, malware, etc. Best of luck.