Examine source code of Letterboxd Private Notes

{
  "manifest_version": 3,
  "name": "Letterboxd Private Notes",
  "version": "1.0.1",
  "description": "Add private private notes stored locally on Letterboxd film pages.",
  "homepage_url": "https://github.com/Porggg/letterboxd-private-notes",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d1f07e9d-937b-4b2a-991d-05fe8bbd5c2d}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "cookies"
  ],
  "host_permissions": [
    "*://letterboxd.com/*",
    "*://*.letterboxd.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://letterboxd.com/film/*",
        "*://*.letterboxd.com/film/*",
        "*://letterboxd.com/*/film/*",
        "*://*.letterboxd.com/*/film/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_title": "Letterboxd Private Notes",
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  }
}