Examine source code of Quick Notes is

{
  "manifest_version" : 2 ,
  "name" : "Quick Notes",
  "version" : "1.0",
  "description" : "Take quick notes in your browser",
  "permissions" : [
    "storage" 
  ],
  "browser_action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "icon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ab338d46-f172-409b-8b3c-48d1a32e36a0}"
    }
  }
}