hello bill4540, this sounds like a scam tactic that is trying to trick you into installing malware, so don't download or execute this kind of stuff! only download firefox from its official location at mozilla.org - in addition updates are handled automatically by firefox so you don't have to download anything (you can always manually initiate a check for updates in the firefox menu ≡ > help ? > about firefox).

you might also want to run a full scan of your system with the security software already in place but also different other tools like the free version of malwarebytes & adwcleaner in order to make sure that there isn't already some sort of malware active on your system that triggers these false alerts. Troubleshoot Firefox issues caused by malware

Yes this sounds like one of those fake Firefox update pages.

Always get Firefox update in Firefox itself or by from mozilla.org

. 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 web site of the True Owner of the program in question. For example, to check out Firefox, go to Mozilla.org. {web link}

You can also 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}