Unless you are on the beta channel, you should only get updates now and then.

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

DO NOT USE ANY OF PROVIDED LINKS

While this may be a legitimate message, it could also be Malware or a Virus. Anytime 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

You can report such a site at; http://www.google.com/safebrowsing/report_phish/ Google Report Phishing Page which is the same when done while on site by going to Help > Report Web Forgery

http://www.mozilla.org/en-US/legal/fraud-report/ Help us safeguard Mozilla’s trademarks by reporting misuse

https://support.mozilla.org/en-US/kb/avoid-and-report-mozilla-tech-support-scams

Hi

A Firefox major update to version 81.0 has been released recently (a major release is issued about once a month). When a new major version is released then it is always possible that issues are reported that need to be addressed with one or more minor updates and issues that need to be fixed made it necessary to release Firefox 81.0.1 last week.

• https://www.mozilla.org/en-US/firefox/81.0.1/releasenotes/