Examine source code of Google Keep Quick Note V2

{
  "manifest_version" : 2 ,
  "name" : "Google Keep Quick Note V2",
  "version" : "1.3",
  "description" : "Quickly save notes, selected text, or webpage links to Google Keep.",
  "icons" : {
    "32" : "icons/logo_32.png",
    "64" : "icons/logo_64.png",
    "128" : "icons/logo_128.png"
  },
  "browser_action" : {
    "default_popup" : "popup.html",
    "default_icon" : "icons/logo_64.png"
  },
  "permissions" : [
    "activeTab" ,
    "storage" ,
    "tabs" ,
    "contextMenus" 
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ],
    "persistent" : false 
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "content.js" 
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d33c87a-0e33-4653-bcce-301e7e3f3a64}"
    }
  }
}