Chrome Extension Working only for one URL

i am creating a chrome extension i created a diretory with 1.background.js 2.icon.png 3.icon2.png 4.manifest.json 5.myscript.js

my manifest.json code is

{
  "manifest_version": 2,

  "name": "One-click Kittens",
  "description": "This extension demonstrates a browser action with kittens.",
  "version": "1.0",
"background": {
    "scripts": ["background.js"]
  },

  "permissions": [ "storage"],
"content_scripts": [
    {
      "matches": ["http://*/*"],
      "js": ["myscript.js"]
    }
  ],
  "browser_action": {
    "default_icon": "icon.png"
  }
}

    }
    iframe.onload = function(){

    var iframeDocument = iframe.contentDocument || iframe.contentWindow.document;
    if(iframeDocument != null)
    {var bb=iframeDocument.getElementById('mybutton');
    if(bb != null)
    {
    bb.addEventListener("click",addingevent,false)
    alert("Hello World");

    }}

    }

and the code for background.js is

chrome.extension.onMessage.addListener(
  function(request, sender, sendResponse) {

    console.log("from a content script:from the extension");

chrome.storage.local.get("icon",function(val){

if(val.icon == "icon1")
{chrome.browserAction.setIcon({"path" :"icon2.png"},function(){});
chrome.storage.local.set({"icon":"icon"},function(){});
}
else
{chrome.browserAction.setIcon({"path" :"icon.png"},function(){});

chrome.storage.local.set({"icon":"icon1"},function(){});

}

});

sendResponse({resp: "success"});

  });

objective of this extension is when user click on the button which is in the frame loaded from url http://onemoredemo.appspot.com/ icon should be toggled between icon.png and icon2.png

this extension works perfectly when i load it in webpage with url http://onemoredemo.appspot.com/ there is frame created and when i click button it is changing icon but when i open url stackoverflow.com then frame is created and showing a button in it,but when i click on the button icon remains same i am expecting that icon will be changed irrespective of url why its not changing in other url??please specify the reason

There are multiple issues

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