Examine source code of YouTube Resolution Lock

{
  "manifest_version": 2,
  "name": "YouTube Auto Quality",
  "version": "1.0.0",
  "description": "Automatically set your preferred video quality for all YouTube videos",
  "permissions": [
    "storage",
    "*://*.youtube.com/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{33159ba5-a0fb-41b2-9590-3e45df59f915}"
    }
  }
}