Help pls with image deletion

just now i was deleting some duplicate(or nearly) images on my game and that popup where you can check the box to prevent it from coming so you can just delete without having to confirm. Problem is now...the popup dont come up but nothing will delete. Can someone tell me how to get the box back up again so i can continue my mod cleanup? thanks

My guess is that you clicked on a setting to prevent popups in your browser, so you'll probably have to re-enable popups. It should be at  chrome://settings/content/popups?search=pop for Chrome (I'm not sure about Firefox but it'll be something similar.) Or if you recently installed any kind of anti-malware type software that might be preventing popups as well. Have you tried using a different browser? Or turning off your computer and turning it back on? If there's a glitch that might resolve it.