Is the page a orange background with a large Firefox icon with the words Urgent Firefox Update and serving a firefox-patch.js file? then this is Fake as it is not from Mozilla or the Firefox web browser.

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 random name of the websites alone should raise a flag that it was not legit.

The Firefox updates have not changed as they are done internally in Firefox (with a .mar type of file) whether on Windows, Mac OSX or Linux (since Firefox 1.5 almost eleven years ago) 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 every so often though not as much in last couple months. https://support.mozilla.org/en-US/forums/contributors/712056/

Even if you were to download this firefox-patch.js file it is not a risk unless you were to try and run it.

https://support.mozilla.org/en-US/kb/i-found-fake-firefox-update

Thanks for the incredibly fast reply. Yes, it was exactly as you said with the orange background and everything. I haven't noticed any change in the Firefox updates, but I'd rather be safe than sorry. This was the first time I've experienced this, thankfully, but I always appreciate the input from individuals even more experienced than I.