Examine source code of NattyNote

{
  "name": "NattyNote",
  "description": "Take time-stamped YouTube notes.",
  "version": "2.1.2",
  "manifest_version": 2,
  "author": "Ahmad Alq",
  "icons": {
    "48": "icons/nn.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{13558633-c36e-4451-a180-ac70f734c6ce}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "clipboardWrite",
    "*://*.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "nattynote.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "styles/*"
  ],
  "browser_action": {
    "default_title": "Whereami?",
    "default_popup": "./interface/cached.html"
  },
  "options_ui": {
    "page": "./interface/nattybox.html",
    "open_in_tab": true
  }
}