Examine source code of CoponCode

{
  "manifest_version": 2,
  "name": "CoponCode",
  "description": "Instantly know about coupon codes while shopping.",
  "version": "1.0.4resigned1",
  "author": "CoponCode",
  "icons": {
    "48": "assets/images/icon48.png",
    "96": "assets/images/icon96.png"
  },
  "browser_action": {
    "default_title": "CoponCode",
    "default_icon": {
      "19": "assets/images/icon20.png",
      "20": "assets/images/icon20.png",
      "38": "assets/images/icon38.png"
    },
    "default_popup": "assets/templates/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "assets/js/jquery.min.js",
        "assets/js/coponcode.client.js"
      ],
      "css": [
        "assets/css/client.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "assets/*"
  ],
  "background": {
    "scripts": [
      "assets/js/jquery.min.js"
    ]
  },
  "permissions": [
    "activeTab",
    "https://coponcode.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0ef74399-da2c-4582-9003-b5363538b94b}"
    }
  }
}