Examine source code of Remove Youtube Chat

{
  "manifest_version": 2,
  "name": "RemoveYoutubeChat",
  "version": "1.2",
  "author": "Niv",
  "description": "Remove the YouTube Chat item from the side of videos",
  "icons": {
    "48": "icons/yt-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "removeYTC.js"
      ]
    }
  ]
}