Examine source code of Search Links Scraper

{
  "manifest_version": 2,
  "name": "Search Links Scraper",
  "version": "1.1.1",
  "description": "Extension that parses/collects links founded by search engines: Google, Yandex, Bing, DuckDuckGo into a file.",
  "permissions": [
    "activeTab",
    "tabs",
    "downloads"
  ],
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/search*"
      ],
      "js": [
        "engines/google.js"
      ]
    },
    {
      "matches": [
        "*://yandex.ru/search*"
      ],
      "js": [
        "engines/yandex.js"
      ]
    },
    {
      "matches": [
        "*://yandex.com/search*"
      ],
      "js": [
        "engines/yandex.js"
      ]
    },
    {
      "matches": [
        "*://ya.ru/search*"
      ],
      "js": [
        "engines/yandex.js"
      ]
    },
    {
      "matches": [
        "*://www.bing.com/search*"
      ],
      "js": [
        "engines/bing.js"
      ]
    },
    {
      "matches": [
        "*://duckduckgo.com/*"
      ],
      "js": [
        "engines/duck.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d47413e2-898c-46d5-b5fe-4c9df7163033}"
    }
  }
}