There is no such thing as urgent Firefox patches.

This sounds like you encountered a site claiming to have what is a fake Firefox patch .exe. The fake updates exe can install things like trojans, viruses or unwanted software based on past reports.

The desktop Firefox is not just for Windows as it is for Mac OSX and Linux also so .exe would not be an effective way to send out Firefox updates. The updates are done internally in Firefox (with a .mar file) during automatic and check for updates or by download from mozilla.org like say www.mozilla.org/firefox/all/

Even if Mozilla were to use .exe for Firefox updates on Windows, they would be serving them from a *.mozilla.org url and not from random websites with weird names.

There was actually a 47.0.1 update on June 28 https://www.mozilla.org/firefox/47.0.1/releasenotes/ however it is not a automatic update and will be for those who manually check for Firefox updates in Help or by download at mozilla.org or www.mozilla.org/firefox/all/

Report fake Firefox updates sites like this as "distributing modified Firefox/malware" at https://www.mozilla.org/legal/fraud-report/ (url is at bottom of many mozilla.org sites) and Google may block if reported enough at https://www.google.com/safebrowsing/report_phish/ which can be accessed by Help > Report Web Forgery in Firefox.

If you did run the firefox patch .exe then you may want to scan 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/XP if you don't already have one. Windows 8 has antivirus built-in already.