Examine source code of YT Playlist Builder

{
  "manifest_version": 3,
  "name": "YT Playlist Builder",
  "version": "1.2.1",
  "description": "Search YouTube, filter results by duration and watched status, build a temporary playlist.",
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-playlist-builder@local.ext",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "description": "No data store",
        "why": "N/A",
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "scripting",
    "tabs"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "action": {
    "default_popup": "ui.html",
    "default_title": "YT Playlist Builder"
  }
}