So you are getting a random name website page claiming to have a so called urgent update for Firefox and a prompt to download a fake firefox-patch.js file?. The random name of the website alone should raise a flag that it was not legit.

This is not from Mozilla or the Firefox web browser. The fake firefox-patch.exe and firefox-patch.js files can install things like trojans, viruses, unwanted software or to download additional stuff onto Windows based on past reports if the user runs them.

The Firefox updates are done internally in Firefox (with a .mar type of file) whether on Windows, Mac OSX or Linux or by download from mozilla.org like say www.mozilla.org/firefox/all/

You could try using a adblocker extension like uBlock Origin to block theses fake ads if you keep getting them. https://addons.mozilla.org/firefox/addon/ublock-origin/

Unfortunately this has gone on for a while now with one or two new sites reported almost everyday. https://support.mozilla.org/en-US/forums/contributors/712056/

Since you tried to run this fake firefox-patch.js file before asking about it I suggest you try and do some scans on your WIndows.

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 if you don't already have one. Windows 8/10 have antivirus protection built-in.

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

Firefox-patch.js did get run on my computer and I ran all of the programs listed here (http://mzl.la/1xKrH3p) in order and malwarebytes found 1 registry entry and 2 .LNK files it didn't like and superantispyware found 2000+ cookies if felt were ad/tracking cookies. I also refreshed firefox. Do you think I need to keep looking?