URI: 

       visibility.js - firefox-fix-web - Firefox extension: fix web
  HTML git clone git://git.codemadness.org/firefox-fix-web
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       ---
       visibility.js (772B)
       ---
            1 // from: https://addons.mozilla.org/en-US/firefox/addon/disable-page-visibility/
            2 
            3 // visibilitychange events are captured and stopped
            4 document.addEventListener("visibilitychange", function(e) {
            5     e.stopImmediatePropagation();
            6 }, true, true);
            7 
            8 // document.visibilityState always returns false
            9 Object.defineProperty(Document.prototype.wrappedJSObject, "hidden", {
           10     get: exportFunction(function hidden() { return false; }, window.wrappedJSObject),
           11     enumerable: true, configurable: true
           12 });
           13 
           14 // document.visibilityState always returns "visible"
           15 Object.defineProperty(Document.prototype.wrappedJSObject, "visibilityState", {
           16     get: exportFunction(function visibilityState() { return "visible"; }, window.wrappedJSObject),
           17     enumerable: true, configurable: true
           18 });