manifest.json

{
  "name": "__MSG_AppName__",
  "version": "2.1.2",
  "manifest_version": 3,
  "description": "__MSG_AppDescription__",
  "permissions": ["storage", "scripting"],
  "host_permissions": ["*://*.youtube.com/*"],
  "default_locale": "en",
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": ["*://*.youtube.com/*"],
      "css": ["css/content_script.css"],
      "js": ["js/utils.js", "js/player.js", "js/content_script.js"]
    }
  ],
  "action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "16": "images/icons/normal/icon-16.png",
      "48": "images/icons/normal/icon-48.png",
      "32": "images/icons/normal/icon-128.png"
    }
  },
  "icons": {
    "16": "images/icons/normal/icon-16.png",
    "48": "images/icons/normal/icon-48.png",
    "128": "images/icons/normal/icon-128.png"
  }
}