Examine source code of Bookmark on NewTab

{
  "version": "3.3.9",
  "default_locale": "en",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDesc__",
  "chrome_url_overrides": {
    "newtab": "assets/html/newtab.html"
  },
  "content_security_policy": "default-src 'none'; img-src 'self'; script-src 'self'",
  "permissions": [
    "bookmarks"
  ],
  "icons": {
    "16": "assets/img/icon_16.png",
    "32": "assets/img/icon_32.png",
    "64": "assets/img/icon_64.png",
    "128": "assets/img/icon_128.png"
  },
  "author": "FdevObl",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ccfe871-476f-4627-ad67-52d2dc19ea8d}"
    }
  }
}