STOP! That is a malware phish.

Mozilla has not changed the way Firefox updates: you would never get a popup emanating from suspiciously named website, you would never get a download dialog, and updates are never .js files.

About This Attack

Please see: I found a fake Firefox update

Since these redirects seem to be triggered by ads on some websites, you might consider an ad blocking extension such as the following:

https://addons.mozilla.org/firefox/addon/ublock-origin/

Updating Safely

Please see: Update Firefox to the latest release

meridianclan said

I run mozilla/firefox. This java script patch was apparently sent to me from firefox - is it legitimate?

Are you thinking it was from the Firefox web browser or from Mozilla simply because it had a big Firefox icon on page?

Anybody can create a page with a product icon and then serve a fake download and claim it was a update for said product. This has been done with Flash Player and Java plugins for a long while for example. The random name of the website for example should raise a big flag on its legitimacy.

Mozilla does have a legit new Release recently as Firefox 48.0 was released on Aug 2nd and can be updated internally in Firefox by checking for updates or by download from say www.mozilla.org/firefox/all/

This unfortunately has been going on for a couple months now as I added the uabeeprozdravi to the long list of fake sites at https://support.mozilla.org/en-US/forums/contributors/712056