. Whenever you get a message / popup that software / files need to be updated;

DO NOT USE ANY OF THE PROVIDED LINKS

While this may be a legitimate message, it could also be Malware or a Virus. Any time you want or need to check for upgrades, go to the website of the True Owner of the program in question. For example, to check out Firefox, go to https://www.mozilla.org {web link}

You can report such a site at; Google Report Phishing Page {web link} which is the same when done while on site by going to Help > Report Web Forgery

Help us safeguard Mozilla’s trademarks by reporting misuse {web link}

My question was: Since I only clicked on the "disable" button, did I harm my computer and if so, what do I do to fix it.

I did not download anything, since my click led to a proposed download that did not have a true Mozilla look to the graphics.  So I exited.  But today I was viewing a facebook posting, and I clicked on something else that looked innocent, and my computer went crazy.  It announced LOUDLY that my computer was in danger and I needed to call a number on the screen immediately.  It listed a Mozilla error number.  I had to completely close down the computer to get rid of it.  Sorry - hard to explain in a short question.  I will report.

If nothing was downloaded, you should be safe. Just in case,

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

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

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/

Firefox 48.0 has been the current Release since Aug 2nd. https://www.mozilla.org/firefox/48.0/releasenotes/

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 several weeks now with one or two new sites reported almost everyday. https://support.mozilla.org/en-US/forums/contributors/712056/ and https://support.mozilla.org/en-US/forums/contributors/712075