script.user.js

// ==UserScript==
// @name WrongEveryTime image insert
// @description Add image after clicked link on wrongeverytime.com

// @author SkySkimmer
// @version 1.1
// @history        1.1 Insert images button
// @history        1.0 Initial functionality
// @license WTFPL
// @namespace SkySkimmer

// @include http://wrongeverytime.com/*
// ==/UserScript==

if (typeof String.prototype.startsWith != 'function') {
  String.prototype.startsWith = function (prefix) {
    if (this.length < prefix.length)
    return false;
    for (var i = prefix.length - 1; (i >= 0) && (this[i] === prefix[i]); --i);
    return i < 0;
  };
}

function insertAfter(newNode, referenceNode) {
    referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
}

var links = document.getElementsByTagName('a');

for (var i = 0; i < links.length; i++)
{
  if (links[i].href.startsWith('http://i.imgur.com/'))
  {
    links[i].onclick = function () {
  	var img = document.createElement('img');
  	img.className = 'size-full';
  	img.src = this.href;
  	img.style.display = 'block';
	insertAfter(img, this);
	this.onclick = null;
    return false; };
  }
}

var cat = document.getElementById('menu-categories');
var cell = document.createElement('li');
cell.className = 'menu-item menu-item-type-post_type menu-item-object-page';

var input = document.createElement('button');
input.type = 'button';
input.appendChild(document.createTextNode('Insert images'));
input.onclick = function () {
	this.onclick = null;
	for(var i=0; i<links.length; i++)
	{
		if (links[i].href.startsWith('http://i.imgur.com/'))
		{
			links[i].onclick  = null;
			var img = document.createElement('img');
	  		img.className = 'size-full';
		  	img.src = links[i].href;
		  	img.style.display = 'block';
			insertAfter(img, links[i]);
		}
	}
	this.innerHTML += ' (done)';
};

cell.appendChild(input);

cat.appendChild(cell);