I got some unwanted notifications today from a website called TechCrunch. although I have disabled notifications using System Preferences I want any trace of that bastard site removed forever. how can I do this? thanks in advance. I hope you understood my question. edit possibly not the most accurate or helpful subject line. now I can't change it. sorry!
You probably allowed the site to push notifications to you when visiting. You can turn it off e.g. deny it in Safari-->Preferences. Or remove the site altogether.