Q: apple-secure.info

It is a scam. Do not respond.

Force quit Safari, then restart Safari while holding the shift key.

Read Phony "tech support" / "ransomware" popups and web pages.

Use the "Force Quit" technique since that one spawns too many windows or tabs to close all at once.

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I had the same experience. Before I thought to check it out. I called the number and gave the 'Indian' sounding caller initial personal info (name, PO Box, etc) but balked as soon as I was told it would cost me. At that point I refused and told the caller I wanted to check with Apple. I then realized the scam and refused the "service". I then hung up. I was called back and I told the scammer I refused and to stop calling, then hung up.

My question is - should I be concerned about having given my name, PO address and location (town and zip.) Again, I did not provide financial info (or SS# either.)

Should I be checking for viruses or trojans? If yes, recommend best anti-virus/malware  software, please.

Force Quit then reopen Safari and immediately "Reset Safari"

I too got this virus warning too. However, doing the force-quit, the Shift-Safari, the command-W, turned off wifi and rebooted etc....didn't work of me...I still get the pop-up when I open Safari...any ideas what I can do? Thanks.

I had the same experience as you.  Found this on SafeMac and it worked!  Good luck:

Quit Safari. If you are unable to do that, press command-option-esc to display the Force Quit Applications window. In that window, select Safari and click the Force Quit button.

To prevent the malicious page from reloading automatically, and thus the pop-up from reappearing, hold down the shift key while launching Safari.

If that doesn’t work, quit Safari again, then navigate to the following folder:

~/Library/Saved Application State/

(If you are not sure how to find this folder, see Locating files from paths.)

Inside that folder, find the folder named com.apple.Safari.savedState. Drag that to the trash.

Next, go to the following folder:

~/Library/Safari/

In that folder, drag the LastSession.plist file to the trash. Now open Safari, and the message should be gone.