New a.cc javascript extension. Adds a 'ban' link by every post which can be used to ban that annoying user you're tired of hearing from.

To install, select all of this text (make sure to scroll down!) and copy it to your clipboard (control + C):

// Ignore Poster app Version 0.1
//
// namespace: ban

// This class represents a post in the thread
//
// class ban_Post
// {

  // id should reference an id value for the table containing the post.
  // doc is an option value.  Defaults to global document.
  function ban_Post(id, doc)
  {
    if(!doc)
      doc = document;
    
    this.id = id;
    this.doc = doc;
    this.table = doc.getElementById(id);
    this.tableBackup = null;
    this.memberId = this.getMemberId();
    this.showing = true;
  }

  ban_Post.prototype.createBackup = function()
  {
    this.tableBackup = this.table.cloneNode(true);
  }

  ban_Post.prototype.hide = function()
  {
    if(!this.showing)
      return;

    this.table.innerHTML = '<tr><td><center>Poster banned. <a id="ban_link' + ++ban_linkNum + '" href="javascript:;">unban</a></center></td></tr>';

    this.showing = false;

    var post = this;
    
    this.doc.getElementById("ban_link" + ban_linkNum).onclick = function()
    {
      var id = post.memberId;
      
      if(id.length)
        ban_setBanned(id, false);
      
      post.show();
    }
  }

  ban_Post.prototype.show = function()
  {
    if(this.showing)
      return;

    this.table.parentNode.replaceChild(this.tableBackup.cloneNode(true), this.table);

    this.showing = true;
  }

  // Returns true if this post should be banned or false otherwise
  ban_Post.prototype.isBanned = function()
  {
    var id = this.getMemberId();
    
    return id.length ? ban_isBanned(id) : false;
  }
  
  ban_Post.prototype.getMemberId = function()
  {
    var str = this.table.className.toString();
    var end = str.indexOf(' ');

    if(end == -1)
      return "";

    var ret = str.substring(1, end);

    if(ret == null)
      ret = "";

    return ret;
  }

  ban_Post.prototype.getHeader = function()
  {
    var divs = this.table.getElementsByTagName("DIV");

    for(var i = 0; i < divs.length; i++)
      if(divs[i].className == "header")
        return divs[i].innerHTML;
    
    return null;
  }

  ban_Post.prototype.setHeader = function(header)
  {
    var divs = this.table.getElementsByTagName("DIV");

    for(var i = 0; i < divs.length; i++)
      if(divs[i].className == "header")
        divs[i].innerHTML = header;
  }

// }

// Returns true if the member with id 'memberId' is banned.
// isBanned finds this information in the cookies
function ban_isBanned(memberId)
{
  return ban_readCookie("ban_" + memberId) != null;
}

// Sets the member with id 'memberId' to either banned or
// not banned depending on if 'isBanned' is true or false
// respectively.
function ban_setBanned(memberId, isBanned)
{
  if(isBanned == null || isBanned)
    ban_createCookie("ban_" + memberId, 1);
  else
    ban_eraseCookie("ban_" + memberId);

  ban_updateBans();
}

// Returns a list of ban_Post instances that have been found
// doc is the document to search, defaults to the global document
function ban_findPosts(doc)
{
  if(!doc) doc = document;
  
  var tables = doc.getElementsByTagName("table");
  var posts = new Array;

  for(var i = 0; i < tables.length; i++)
    if(tables[i].id.indexOf("post-") == 0)
      posts[posts.length] = new ban_Post(tables[i].id, doc);

  return posts;
}

var ban_linkNum = 0;

function ban_updateBans()
{
  if(posts == null)
    return;

  for(var i = 0; i < posts.length; i++)
    if(posts[i].isBanned())
      posts[i].hide();
    else
      posts[i].show();
}

var posts = null;

function ban_load_helper(aTag)
{
  aTag.onclick = function()
  {
    if(this.ban_memberId)
      ban_setBanned(this.ban_memberId);
  }
}

function ban_load()
{
  posts = ban_findPosts(document);

  for(var i = 0; i < posts.length; i++) {
    
    posts[i].setHeader(posts[i].getHeader()
      + '<a id="ban_link' + ++ban_linkNum + '" href="javascript:;">Ban</a>');

    var a = document.getElementById("ban_link" + ban_linkNum);

    if(a != null) {

      a.ban_memberId = posts[i].memberId;
      ban_load_helper(a);
    }

    posts[i].createBackup();

    if(posts[i].isBanned())
      posts[i].hide();
  }
}

doc.add_onLoad(ban_load);

// Cookies!
// {
  function ban_createCookie(name,value,days) {
  	
  	if(days == null)
  		days = 365;
  	
  	var date = new Date();
  	date.setTime(date.getTime()+(days*24*60*60*1000));
  	var expires = "; expires="+date.toGMTString();

  	document.cookie = name+"="+value+expires+"; path=/";
  }
  
  function ban_readCookie(name) {
  	var nameEQ = name + "=";
  	var ca = document.cookie.split(';');
  	for(var i=0;i < ca.length;i++) {
  		var c = ca[i];
  		while (c.charAt(0)==' ') c = c.substring(1,c.length);
  		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  	}
  	return null;
  }
  
  function ban_eraseCookie(name) {
  	ban_createCookie(name,"",-1);
  }
// }

Then navigate to the extensions page and select the bottom text box with your mouse and paste (control + V). You must be logged in to navigate to this page.

Click save and enjoy!

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