Examine source code of DocDocDoc for Google Docs

{
  "manifest_version": 3,
  "name": "DocDocDoc for Google Docs",
  "version": "0.1.3",
  "description": "Turn Google Docs into a side-by-side, multi-page writing workspace built for long-form editing, revision, and review.",
  "content_scripts": [
    {
      "matches": [
        "https://docs.google.com/document/*"
      ],
      "js": [
        "content-script.js"
      ],
      "css": [
        "content-style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "DocDocDoc for Google Docs",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gdocs-docdocdoc@docdocdoc.app",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "109.0"
    }
  }
}