A Greasemonkey/Tampermonkey script, which enables the user to view nsfw pictures instead of the annoying NSFW banners on 9gag. No 9gag sign up required anymore!

9gag_nsfw_view.user.js

// ==UserScript==
// @name       		9GAG NSFW picture peeker
// @include		http://9gag.com/*
// @version		0.1.6
// @description  	9GAG NSFW peeker
// @require       	http://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.js
// @copyright  		2012+, Error418
// ==/UserScript==

/*
        ____  _________   ______   _   _______ _______       __                   __            
       / __ \/ ____/   | / ____/  / | / / ___// ____/ |     / /  ____  ___  ___  / /_____  _____
      / /_/ / / __/ /| |/ / __   /  |/ /\__ \/ /_   | | /| / /  / __ \/ _ \/ _ \/ //_/ _ \/ ___/
      \__, / /_/ / ___ / /_/ /  / /|  /___/ / __/   | |/ |/ /  / /_/ /  __/  __/ , \/  __/ /    
     /____/\____/_/  |_\____/  /_/ |_//____/_/      |__/|__/  / .___/\___/\___/_/|_|\___/_/     
                                                             /_/                                 
  
  
	Thanks for using this script. Feel free to spread the word and leave a comment on this gist :)
  
  		Version 0.1.6
        	- must use GET requests for content-checking.. Thanks 9GAG for not obeying standards!
  
  		Version 0.1.5
  			- Got rid of some annoying bugs
  
		Version 0.1.4
        		- I can now determine between GIF and JPG!
        		- I am much faster!
        		- This version history is also new
        
        Have fun!

*/

$(document).ready( function() {
    
    function NSFWImage(targetContainer, imgUrl) {
        targetContainer.removeClass("badge-nsfw-entry-cover");
        
        this.targetContainer = targetContainer;
        this.imageUrl = imgUrl;
    }
    
    NSFWImage.prototype.imgAppend = function(suffix) {
        this.imageUrl = this.imageUrl + suffix;
    };
    
    NSFWImage.prototype.applyImageUrl = function() {
        this.targetContainer.empty();
        var img = document.createElement("img");
        img.src = this.imageUrl;
        this.targetContainer.append(img);
    };
    
    var titties = function(index) {
        
        var targetElement = $(this);
        var urlExtract = /[^\/]*\/gag\/(.*)/;
        
        urlExtract.exec(targetElement.attr("href"));
        
        var nsfw = new NSFWImage(targetElement, "http://d24w6bsrhbeh9d.cloudfront.net/photo/" + RegExp.$1);
        
	GM_xmlhttpRequest({
        	url: nsfw.imageUrl + "_460sa.gif",
		method: "GET",
        	onload: function(response) {
	                if(response.status !== 404) {
	                	nsfw.imgAppend("_460sa.gif");
	                }
	                else {
				nsfw.imgAppend("_700b.jpg");
	        	}
	        	
        		nsfw.applyImageUrl();
            	}
        });
    };
    
    $("a.badge-nsfw-entry-cover").each(titties);
    
    $("div.badge-entry-collection").bind("DOMSubtreeModified", function() {
   	$("a.badge-nsfw-entry-cover").each(titties); 
    });
});