Examine source code of Page Edit

{
  "name" : "Page Edit",
  "description" : "An visual editor for HTML elements",
  "version" : "1.0.1.2",
  "manifest_version" : 2 ,
  "permissions" : [
    "tabs" ,
    "<all_urls>" ,
    "storage" 
  ],
  "background" : {
    "scripts" : [
      "/src/background/background.js" 
    ]
  },
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "/src/content/content.js" 
      ]
    }
  ],
  "browser_action" : {
    "default_title" : "Page Edit",
    "default_popup" : "/src/popup/popup.html",
    "default_icon" : "/images/logo-128.png"
  },
  "icons" : {
    "16" : "/images/logo-16.png",
    "32" : "/images/logo-32.png",
    "48" : "/images/logo-48.png",
    "128" : "/images/logo-128.png"
  }
}