Examine source code of Grammar Checker

{
  "manifest_version": 2,
  "name": "Grammar Checker",
  "description": "Free Grammarchecker.com extension",
  "version": "1.0.1",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "62": "mob_logo.png"
  },
  "permissions": [
    "*://*.en.wiktionary.org/*",
    "storage",
    "identity",
    "webRequest",
    "<all_urls>",
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "jquery.min.js",
        "content.js",
        "popup.js",
        "wiktionary-parser.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d1c97135-d720-44e1-9a3c-5e163026a098}"
    }
  }
}