Examine source code of Restore Youtube Dislikes and the IMDB forums

{
  "manifest_version": 2,
  "name": "YouTube Dislike and IMDb forum restorer",
  "description": "Restores forums to IMDb and you can continue posting to them on filmboards.com and restores dislike counts for YouTube videos",
  "version": "1.17",
  "permissions": [
    "*://*.filmboards.com/*",
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "http://www.imdb.com/title/*",
        "https://www.imdb.com/title/*",
        "http://www.imdb.com/name/*",
        "https://www.imdb.com/name/*",
        "http://m.imdb.com/title/*",
        "https://m.imdb.com/title/*",
        "http://m.imdb.com/name/*",
        "https://m.imdb.com/name/*",
        "*://*.youtube.com/*"
      ],
      "css": [
        "board.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}