Examine source code of Rooster Youtube Tools

{
  "manifest_version": 2,
  "name": "Rooster Youtube Tools",
  "description": "Display language pair subtitles for Youtube Videos",
  "version": "1.20",
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/watch?v=*",
        "https://youtu.be/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "https://lb.dioco.io/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{377f5128-4b34-4ac5-a079-a95985858ab6}"
    }
  }
}