Anti-RickRoll

Inserts a small picture of Rick Astley's face next to links to 'Never Gonna Give You Up' (currently set up for tumblr only).

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name        Anti-RickRoll
// @namespace   antirickroll
// @description Inserts a small picture of Rick Astley's face next to links to 'Never Gonna Give You Up' (currently set up for tumblr only).
// @include     http*://*.tumblr.com/*
// @version     1.1
// @grant       none
// ==/UserScript==

var urls = ['https://www.youtube.com/watch?v=oHg5SJYRHA0', 'http://www.youtube.com/watch?v=oHg5SJYRHA0', 'https://www.youtube.com/watch?v=dQw4w9WgXcQ', 'http://www.youtube.com/watch?v=dQw4w9WgXcQ']

waitForKeyElements ("div.post_container", placeTheFace);

// This runs for every post container as they load.
function placeTheFace(jNode){  
  var links = jNode.find('a');
  for (i=0; i<links.length; i++){
    if(isRickRoll(links[i].href)){
      links[i].innerHTML = links[i].innerHTML + "<img src='http://www.lpassociation.com/forums/smilies/rick.png' alt='This link is a rick roll' style='width: 13px; display:inline;'>";
    }
  }  
}

function isRickRoll(url){
  for (var u in urls){
     if(urls[u] == url){
       return true;
     }
  }    
  return false;
}