popup on click not working

Try instead <a href="#" class="spu-open-60056">WP Popup</a>

Same here. It works on Chrome and Firefox (private window), but not on Firefox (normal window).

@lexarks that sounds like a cookie issue. Please read this https://wppopups.com/docs/how-to-configure-popup-closing-and-cookies/ and if you are still having issues open a new thread.

To be sure, you cannot reopen a closed window by clicking on the button? I thought with the button you can open a window when you want to.