Examine source code of JSON Viewer Pro

{
  "browser_specific_settings": {
    "gecko": {
      "id": "jaswantk9177@gmail.com"
    }
  },
  "name": "JSON Viewer Pro",
  "short_name": "JSON Viewer",
  "offline_enabled": true,
  "version": "1.0.1",
  "manifest_version": 2,
  "icons": {
    "16": "images/icons/icon-16.png",
    "38": "images/icons/icon-32.png",
    "128": "images/icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "/js/background.js"
    ]
  },
  "options_page": "options.html",
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "ftp://*/*",
        "file:///*"
      ],
      "js": [
        "/js/contentScript.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": "images/icons/icon-16.png"
  },
  "permissions": [
    "*://*/*",
    "contextMenus"
  ],
  "web_accessible_resources": [
    "/js/main.js",
    "/css/main.css",
    "/css/themes/mdn.css",
    "options.html",
    "images/icons/gear.png"
  ]
}