You can see a pop-up block icon in the right corner of the Status Bar if you have chosen to hide the information bar at the top. You can left-click that pop-up block icon on the Status Bar and remove the check mark from "Don't show info message when pop-ups are blocked"

You can look at these prefs on the about:config page and reset them via the right-click context menu: Status bar icon: browser.popups.showPopupBlocker Info bar at the top: privacy.popups.showBrowserMessage

To open the about:config page, type about:config in the location (address) bar and press the Enter key, just like you type the url of a website to open a website. If you see a warning then you can confirm that you want to access that page.

This advice works great. Thanks for your time. Sincerely, Dick