Block elements on a webpage.

block-elements.js

javascript: var evtHandler = function (e) {
    e.preventDefault();
    e.stopPropagation();
    if (confirm("Do you want to delete this element?")) {
        e.target.remove();
    }
    document.body.removeEventListener("click", evtHandler);
};
document.body.addEventListener("click", evtHandler);
// To use: run the code, click an element to delete it.
// Use at your own risk! If you do not trust the code, DO NOT USE IT!

block-elements.min.js

javascript:/*Thanks to uglifyjs.net */var evtHandler=function(e){e.preventDefault();e.stopPropagation();if(confirm("Do you want to delete this element?")){e.target.remove()}document.body.removeEventListener("click",evtHandler)};document.body.addEventListener("click",evtHandler);

This doesn't work on <iframe> elements (which are used to host (Google) ads), so it kinda defeats the purpose 😅 😳
Note: you have to click it every time you want to block an element..