Examine source code of PixelBuddy

{
  "manifest_version": 2,
  "name": "PixelBuddy",
  "version": "1.1",
  "description": "Sends info on Youtube/Netflix/Amazon videos to PixelBuddy.",
  "icons": {
    "48": "icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/watch*",
        "*://*.netflix.com/watch/*",
        "*://*.primevideo.com/detail/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ]
}