Examine source code of Playlistless

{
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "@playlistless-by-sparrownest",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "name": "__MSG_extensionName__",
  "version": "1.0",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "icons": {
    "48": "icons/playlistless-48.png",
    "96": "icons/playlistless-96.png"
  },
  "permissions": [
    "menus",
    "contextMenus",
    "tabs"
  ],
  "background": {
    "scripts": [
      "playlistless.js"
    ]
  },
  "host_permissions": [
    "*://*.youtube.com/*"
  ]
}