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'''. Firefox updates has not really changed since Firefox 1.5 days ten years ago as the updates is done internally in Firefox. Also download only from official place like mozilla.org and www.mozilla.org/firefox/all/ These fake patch sites have not been reported nearly as often in the past month but are still popping up. These scammers have used a whole variety of disposable urls as there was one that could be mistaken as a porn site back in September. https://support.mozilla.org/en-US/forums/contributors/712056 https://support.mozilla.org/en-US/kb/i-found-fake-firefox-update