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9GAG.js

// Remap $ to jQuery object
var $ = jQuery;
 
// The real fun begins... first catch all the post-anchors & loop on them
$(document).on("scroll", function () {
  // Let's declare some reusable globals for the next iterations
  var urlBase = "http://img-9gag-lol.9cache.com/photo/";

  $(".badge-evt.badge-nsfw-entry-cover").each(function () {
    // Remove the NSFW class, to avoid redundant processing
    $(this).removeClass("badge-nsfw-entry-cover");
 
    // Find out the ID of the post
    var id = $(this).parent().parent().data("entryId");
    // Hence the best-guess image URL is:
    var imgUrl = urlBase + id + "_460s.jpg";
 
    // Time to inject an image element with source as the formed URL
    $(this).html("<img src=" + imgUrl + " />");
 
    // On click, open the image as GIF in a new tab
    // Do so blindly, as there's no definitive way to be sure
    $(this).attr("href", imgUrl.split("460s").join("460sa").split(".jpg")[0] + ".gif");
    $(this).attr("target", "_blank");
  });
});

// TODO: find a way to handle image versions

youtube.js

// Read the video ID: 
var query = location.search     // Read query param(s)
  , vid = query.split("v=")[1]  // Get the video ID
  , id = query.split("&")[0];   // If multiple query params are present, chuck them

// Whip the browser to haul its ass over to this location
location.assign("http://youtube.com/v/" + id);

howto use this JS file?