Examine source code of PreWatchr for YouTube

{
  "manifest_version": 3,
  "version": "1.3.0",
  "name": "PreWatchr for YouTube",
  "short_name": "PreWatchr",
  "browser_specific_settings": {
    "gecko": {
      "id": "sumthing@jucofuco.github.io",
      "strict_min_version": "112.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  },
  "description": "Preview what a YouTube video is about before opening it, so you can decide if it’s worth watching.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://youtube-summarize-65h8.onrender.com/*"
  ],
  "action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "css": [
        "assets/content.css"
      ],
      "js": [
        "assets/content.js"
      ]
    }
  ]
}