(function() {
   function hookCode(orgFunc, orgCode, myCode) {
      try { eval(orgFunc + "=" + eval(orgFunc).toString().replace(orgCode, myCode)); }catch(e){ Components.utils.reportError("Failed to hook function: "+orgFunc); }
   }

   function hookProp(parentNode, propName, myGetter, mySetter) {
      var oGetter = parentNode.__lookupGetter__(propName);
      var oSetter = parentNode.__lookupSetter__(propName);
      if (oGetter && myGetter) myGetter = oGetter.toString().replace(/{/, "{"+myGetter.toString().replace(/^.*{/,"").replace(/.*}$/,""));
      if (oSetter && mySetter) mySetter = oSetter.toString().replace(/{/, "{"+mySetter.toString().replace(/^.*{/,"").replace(/.*}$/,""));
      if (!myGetter) myGetter = oGetter;
      if (!mySetter) mySetter = oSetter;
      if (myGetter) try { eval('parentNode.__defineGetter__(propName, '+ myGetter.toString() +');'); }catch(e){ Components.utils.reportError("Failed to hook property Getter: "+propName); }
      if (mySetter) try { eval('parentNode.__defineSetter__(propName, '+ mySetter.toString() +');'); }catch(e){ Components.utils.reportError("Failed to hook property Setter: "+propName); }
   }

   window.addEventListener("mousedown", function(event){
      if (event && event.button == 1) {
         window.clickState = 1;
         var ms = nsPreferences.getIntPref("mclickfocustab.timeout", 300);
         setTimeout(function(){ window.clickState = 2; }, ms);
      }
   }, true);

   window.addEventListener("mousemove", function(event){
      window.clickState = 0;
   }, true);

   hookCode("getBrowser().addTab", /return (\S+);/, "if (window.clickState == 2) { this.selectedTab = $1; } if (window.clickState > 0) { window.clickState = -1; } $&");

   hookProp(getBrowser(), "selectedTab", null, function(){
      if ((window.clickState < 0) && this.selectedTab) return val;
   });
})();