Examine source code of YT Channels

{
  "manifest_version": 3,
  "name": "YT Channels",
  "version": "1.1.0",
  "description": "Curated category feeds for the YouTube channels you follow — grouped, on-demand, no algorithm.",
  "author": "Project B",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background/types.js",
      "background/storage.js",
      "background/rss.js",
      "background/resolve.js",
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://youtube.com/*"
      ],
      "js": [
        "content/watch-progress.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "YT Channels"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "storage",
    "menus",
    "tabs"
  ],
  "host_permissions": [
    "*://www.youtube.com/*",
    "*://youtube.com/*",
    "*://youtu.be/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-channels@local.extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}