Delete an element by clicking it. Save this script as the URL of a bookmark, click the bookmark, and then click the element you want to delete. (Click Raw to get to a page that only shows the script source for easier copy-paste.)

deleteElement.js

javascript:(function(){var cursor=document.body.style.cursor;var overlay=document.createElement('div');var iframeCatch=document.createElement('div');var style='border:1px solid #3280FF;background-color:rgba(50,128,255,0.5);position:absolute;z-index:2147483647;display:block;box-sizing:border-box;left:0;top:0;width:0;height:0;margin:0;padding:0;';var ev='pointer-events:none;';var tr='transition:width 60ms,height 60ms,left 60ms,top 60ms;';var br='border-radius:0;';style +=ev+'-webkit-'+ev+'-moz-'+ev;style +=tr+'-webkit-'+tr+'-moz-'+tr;style +=br+'-webkit-'+br+'-moz-'+br;overlay.setAttribute('style',style);document.body.appendChild(overlay);style='border:none;position:absolute;z-index:2147483647;display:none;box-sizing:border-box;left:0;top:0;width:0;height:0;margin:0;padding:0;';style +=br+'-webkit-'+br+'-moz-'+br;iframeCatch.setAttribute('style',style);iframeCatch.addEventListener('mouseout',function(event){this.style.display='none';},false);document.body.appendChild(iframeCatch);document.body.style.cursor="crosshair";var hoverElement=null;window.addEventListener('mouseover',onhover,true);window.addEventListener('click',onclick,true);window.addEventListener('keyup',onkeyup,true);function onhover(event){event.preventDefault();event.stopPropagation();iframeCatch.style.display='none';var docEl=document.documentElement;var body=document.body;var docY=docEl.clientTop||body.clientTop||0;var docX=docEl.clientLeft||body.clientLeft||0;var scrollY=window.pageYOffset||docEl.scrollTop||body.scrollTop||0;var scrollX=window.pageXOffset||docEl.scrollLeft||body.scrollLeft||0;hoverElement=document.elementFromPoint(event.clientX,event.clientY);var rect=hoverElement.getBoundingClientRect();var top=Math.floor(scrollY + rect.top)+'px';var left=Math.floor(scrollX + rect.left)+'px';var width=Math.floor(rect.width)+'px';var height=Math.floor(rect.height)+'px';overlay.style.left=left;overlay.style.top=top;overlay.style.width=width;overlay.style.height=height;if(hoverElement.nodeName==='IFRAME'){iframeCatch.style.left=left;iframeCatch.style.top=top;iframeCatch.style.width=width;iframeCatch.style.height=height;iframeCatch.style.display='block';}}function onclick(event){if(hoverElement&&hoverElement.parentNode){event.preventDefault();event.stopPropagation();hoverElement.parentNode.removeChild(hoverElement);clear();}}function onkeyup(event){if(event.keyCode===27){event.preventDefault();event.stopPropagation();clear();}}function clear(){if(overlay.parentNode)overlay.parentNode.removeChild(overlay);if(iframeCatch.parentNode)iframeCatch.parentNode.removeChild(iframeCatch);document.body.style.cursor=cursor;window.removeEventListener('mouseover',onhover,true);window.removeEventListener('click',onclick,true);window.removeEventListener('keyup',onkeyup,true);hoverElement=null;}})();