chrome-ytm-export/manifest.json

{
  "manifest_version": 3,
  "name": "YTM Export",
  "description": "Youtube Music Playlist Exporter",
  "version": "1.0",
  "action": {
    "default_popup": "src/popup.html",
    "default_icon": "128.png"
  },
  "permissions": ["activeTab", "scripting"],
  "content_scripts": [
    {
      "matches": ["https://music.youtube.com/playlist*"],
      "js": ["src/playlist_content_script.js"]
    }
  ]
}