How do I report a virus attack on Firefox?

I got an email, supposedly from Microsoft with an update on its terms, from a microsoft.com email address. I clicked on it and it went to a Captcha window. Trying to click on the items (in my case, bicycles in the pictures) triggered multiple warnings that my computer was under an attack and that seven viruses were reported, and I should re-up my subscription with McAffee. I had Trend antivirus enacted on my computer, but discovered the plan was ended by Best Buy and there was no update or way to continue it. I continued to get the notices and clicking on the recommendations to run scans and update McAffee continued to trigger notices of attack. I reactivated my McAffee program, rebooted my computer and opened with Microsoft Edge instead of Firefox. No notices of attack appeared. I ran Windows Update and learned my Windows Defender was current and a scan showed no viruses. The notices of attack only appear when I try to use Firefox. I tried to delete Firefox to see if reinstalling it would resolve the problem but it only allows me to "Refresh" Firefox. What is going on here?