Examine source code of Shopping Assist

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "1.3.3resigned1",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "browser_action": {
    "default_name": "__MSG_extName__",
    "default_icon": "images/icon.png"
  },
  "applications": {
    "gecko": {
      "id": "jid0-rGeZgABJlO75nuquMXUqB888sPE@jetpack",
      "strict_min_version": "48.0"
    }
  },
  "background": {
    "scripts": [
      "jquery-1.12.3.min.js",
      "background.js"
    ]
  },
  "icons": {
    "128": "images/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.amazon.co.jp/*",
        "*://store.shopping.yahoo.co.jp/*",
        "*://item.rakuten.co.jp/*",
        "*://product.rakuten.co.jp/*",
        "*://books.rakuten.co.jp/*",
        "http://kakaku.com/item/*",
        "*://www.amazon.com/*",
        "*://www.ebay.com/*",
        "*://www.ebay.co.uk/*",
        "*://www.amazon.co.uk/*"
      ],
      "js": [
        "jquery-1.12.3.min.js",
        "content_script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "*://*/*",
    "tabs",
    "contextMenus"
  ]
}