Examine source code of Holo Status

{
  "manifest_version": 3,
  "name": "Holo Status",
  "version": "1.1",
  "description": "See the live status of all hololive members channels. Have the ability to set members as your oshi so they appear in the top of the",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "holo-status@mumeino1fan"
    }
  },
  "host_permissions": [
    "https://*.youtube.com/*"
  ],
  "action": {
    "default_popup": "index.html",
    "default_icon": {
      "16": "icon.png",
      "32": "icon.png",
      "48": "icon.png",
      "128": "icon.png"
    }
  }
}