Examine source code of YouTube Comments Crawler

{
  "manifest_version": 2,
  "name": "YouTube Comments Crawler",
  "description": "Extracts all comments from the YouTube video page, sorts them by the amount of likes and saves them to a csv file.",
  "version": "0.4",
  "icons": {
    "16": "images/ico16.png",
    "19": "images/ico19.png",
    "38": "images/ico38.png",
    "48": "images/ico48.png",
    "128": "images/ico128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{02252968-7663-474f-a377-736b3f3a8fab}"
    }
  }
}