Examine source code of TunePort - YouTube to Spotify

{
  "manifest_version": 2,
  "name": "TunePort - YouTube to Spotify (Full)",
  "version": "4.3.8",
  "description": "Add YouTube videos to Spotify playlists and download high-quality audio with lossless source support",
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab",
    "tabs",
    "notifications",
    "downloads",
    "identity",
    "https://youtube.com/*",
    "https://music.youtube.com/*",
    "https://www.youtube.com/*",
    "https://accounts.spotify.com/*",
    "https://api.spotify.com/*",
    "https://cobalt.tools/*",
    "https://*.cobalt.tools/*",
    "https://cobalt-api.meowing.de/*",
    "https://cobalt-backend.canine.tools/*",
    "https://cobalt.micr.dev/*",
    "https://yt.micr.dev/*",
    "http://141.145.192.88:9000/*",
    "https://kityune.imput.net/*",
    "https://blossom.imput.net/*",
    "https://lucida.to/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "settings/index.html",
    "open_in_tab": false
  },
  "icons": {
    "16": "assets/icon-16.png",
    "32": "assets/icon-32.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "web_accessible_resources": [
    "popup/auth-callback.html",
    "popup/auth-success.html",
    "popup/cobalt-auth.html",
    "assets/*"
  ],
  "browser_action": {
    "default_popup": "popup/index.html",
    "default_title": "TunePort - Add to Spotify",
    "default_icon": {
      "16": "assets/icon-16.png",
      "32": "assets/icon-32.png",
      "48": "assets/icon-48.png",
      "128": "assets/icon-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tuneport@microck.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity",
          "websiteContent"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  }
}