Examine source code of Force enable YouTube DVR

{
  "manifest_version": 2,
  "name": "Force enable YouTube DVR",
  "version": "0.6",
  "description": "Enables the YouTube DVR on all streams",
  "icons": {
    "32": "enabled.svg"
  },
  "background": {
    "page": "background.html",
    "persistent": false
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "activeTab",
    "https://www.youtube.com/watch?*",
    "https://www.youtube.com/youtubei/v1/player?*",
    "https://www.youtube.com/c/*/live"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "forcedvr@ohareza.twt",
      "strict_min_version": "79.0"
    }
  },
  "browser_action": {
    "default_icon": {
      "32": "disabled.svg"
    }
  }
}