Examine source code of DNSSEC Checker

{
  "manifest_version": 2,
  "name": "DNSSEC Checker",
  "description": "__MSG_description__",
  "version": "1.0.9",
  "icons": {
    "64": "logo-off.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery.min.js",
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "default_locale": "en",
  "browser_action": {
    "default_icon": "logo-off.png",
    "default_popup": "popup.html"
  },
  "applications": {
    "gecko": {
      "id": "cctld@uzinfocom.uz"
    }
  },
  "permissions": [
    "tabs",
    "webRequest",
    "<all_urls>"
  ]
}