Hi

Yes, this does appear to be a scam and I strongly recommend that you do not agree to that request.

This page details how to check for any updates to Firefox:

https://support.mozilla.org/en-US/kb/update-firefox-latest-release

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

Thank you so much. I did report it to google