Examine source code of yt-ff-remover

{
  "manifest_version": 2,
  "name": "yt-ff-remover",
  "version": "1.0",
  "description": "Hides that horrible feed filter from youtube",
  "icons": {
    "48": "icons/crossed-oval-48.png",
    "96": "icons/crossed-oval-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "css": [
        "ff-remover.css"
      ]
    }
  ]
}