first version that needs to be a userscript

se-chat-iframe-popup.user.js

@@ -0,0 +1,73 @@
+// ==UserScript==
+// @name          Stack Exchange hover popup
+// @description   Shows a popup with a SE question when a link to the question is hovered in the chat
+// @require       http://cherne.net/brian/resources/jquery.hoverIntent.minified.js
+// @include       http://*stackexchange.com/*
+// @include       http://*stackoverflow.com/*
+// @include       http://*mathoverflow.com/*
+// @include       http://*serverfault.com/*
+// @include       http://*superuser.com/*
+// @include       http://*stackapps.com/*
+// @include       http://*askubuntu.com/*
+// @version       2.2
+// ==/UserScript==
+$(function(){
+  var currentFrame = null;
+  $("body").click(function(){
+    if(currentFrame) currentFrame.parentNode.removeChild(currentFrame);
+    currentFrame = null;
+  });
+  $("#chat").hoverIntent({
+    selector: ".content a", 
+    out: function(){console.log("out");},
+    over: function(event){
+      console.log("in %o", this);
+      if(isSeDomain(this.host)){
+        console.log("domain matches");
+        var overlay = document.createElement("div");
+        overlay.style.background = "rgba(0, 0, 0, 0.5)";
+        overlay.style.position = "fixed";
+        overlay.style.top = 0;
+        overlay.style.left = 0;
+        overlay.style.right = 0;
+        overlay.style.bottom = 0;
+
+        var frame = document.createElement("iframe");
+
+        currentFrame = document.createElement("div");
+        currentFrame.style.margin = 5;
+        currentFrame.style.border = "3px solid black";
+        currentFrame.style.borderRadius = 5;
+        currentFrame.style.padding = 10;
+        currentFrame.appendChild(overlay);
+        currentFrame.appendChild(frame);
+        console.log("%o appended", currentFrame);
+
+         GM_xmlhttpRequest({
+          url: link.href,
+          onload: function(response){
+            frame.document.documentElement.innerHTML = response.data;
+           document.body.appendChild(currentFrame);
+          }
+        });
+      }
+    }
+  });
+  function isSeDomain(host){
+    var hosts = ["stackexchange.com", 
+                 "stackoverflow.com", 
+                 "mathoverflow.com", 
+                 "serverfault.com", 
+                 "superuser.com", 
+                 "stackapps.com", 
+                 "askubuntu.com"]
+    host = host.match(/\w+\.\w+$/)[0];
+    return !!~hosts.indexOf(host);
+  }
+}());
+
+/*
+  var s = document.createElement("script");
+  s.src = "http://cherne.net/brian/resources/jquery.hoverIntent.minified.js";
+  document.head.appendChild(s);
+*/

so-post-monitor.user.js

@@ -9,7 +9,7 @@
 // @include       http://*superuser.com/*
 // @include       http://*stackapps.com/*
 // @include       http://*askubuntu.com/*
-// @version       2.1
+// @version       2.2
 // ==/UserScript==
 
 (function () {
@@ -175,6 +175,7 @@
     });
 
     setInterval(UpdateTask.updateAll, UPDATE_TIMEOUT);
+    $(document).on("visibilitychange", UpdateTask.updateAll);
 
     /// timer functions