This is a scam don't call the number in the alert

Yes, it very much looks like a scam. I allowed a comment on my blog while using Microsoft Edge and this problem showed up. The page shows up with this message:

Once this message comes, none of the other pages are reachable.
Steps I took:
Reported the comment on my blog ass scam.
Used the Task Manager to close Microsoft Edge.
Deleted browsing history and cookies.

Right now the Firefox is working. I read that this infects Chrome and Firefox as well. A remedy has been recommended (on the Internet)  to close all programs and hard boot. I will try it next.
Unfortunately you cannot rely on Windows Defender as it does not tell what the problem is.

Notes added: 1:45 PM Hawaii
The problem continues with Microsoft Edge. This post is written on Firefox. Adding the offending site to the Restricted sites did not help the problem.

This IRS email looks like a scam

DO NOT RESPOND TO THIS MESSAGE [Delete it]

Under the logo of IRS you might have received an email in the last couple of days which starts as follows,

"Over 130 million Americans will receive refunds as
part of President Bush program to jump start the economy.

Our records indicate that you are qualified to receive the
2008 Economic Stimulus Refund.
"
followed by couple of more paragraphs and then ending with,

"To access Economic Stimulus Refund, please click here.
"

This appears like a scam as IRS would not send an email like this. Check directly with
IRS