No neither site is legit. The fake updates exe that these fake sites serve 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 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. You can report sites like these at https://www.mozilla.org/legal/fraud-report/ so Mozilla can try and get the sites dealt with and https://www.google.com/safebrowsing/report_phish/ so the sites can be blocked.