Userscript to ignore hot network questions on Stack Exchange sites(tested in Greasemonkey)

khotnet.js

// ==UserScript==
// @name        Stack Exchange Hot Network Questions Filter
// @namespace   kroltan.stackexchange.hotfilter
// @description Allows hiding seen or uninteresting questions from the Hot Network Questions list.
// @include     /^https?://.*\.stackoverflow\.com/.*/
// @include     /^https?://.*\.stackexchange\.com/.*/
// @version     1
// @grant       none
// ==/UserScript==
/*
 * USAGE:
 * To hide a question from the Hot Network Questions list, simply click its site's icon.
 * Ignore lists are per-site, since it uses localStorage.
 * Resetting the ignore list is a bit more involved, open the developer console and run:
 *     khotnet.reset()
 */
$(document).ready(function() {
  var withConfig = function(func) {
    var key = "__krolstack_hotfilter";
    var config = {
      "ignore":[]
    };
    var data;
    if ((data = localStorage.getItem(key)) !== null) {
      config = JSON.parse(data);
    }
    var result = func(config);
    localStorage.setItem(key, JSON.stringify(config));
    return result;
  }
  
  var isIgnored = function(id, config) {
    var inner = function(config) {
      return config.ignore.indexOf(id) > 0;
    };
    return config? inner(config) : withConfig(inner);
  }
  
  var addIgnore = function(id) {
    withConfig(function(config) {
      if (!isIgnored(id, config)) {
        config.ignore.push(id);
      }
    });
  };
  
  var reset = function() {
    withConfig(function(config){
      var ignored = config.ignore;
      while (ignored.length > 0) {
        ignored.pop();
      }
    });
  }
  
  $("<style>" +
    "#hot-network-questions ul li .favicon:hover {" +
    "  background-color: red;" +
    "  cursor: pointer;" +
    "}" +
    "</style>").appendTo("head");
  
  var hotNetList = $("#hot-network-questions ul");
  hotNetList.children("li").each(function(i) {
    var self = $(this);
    var icon = self.children(".favicon");
    var link = self.children("a");
    var linkParts = link.attr("href").split("/");
    var questionID = parseInt(linkParts[linkParts.length - 2], 10);
    
    if (isIgnored(questionID)) {
      self.remove();
    }
    
    icon.click(function(evt) {
      addIgnore(questionID);
      self.remove();
    });
  });
  
  window.khotnet = {
    addIgnore: addIgnore,
    isIgnored: isIgnored,
    reset: reset
  }
});