Examine source code of Shumway SEO Toolkit

{
  "manifest_version": 3,
  "name": "Shumway SEO Toolkit",
  "short_name": "Shumway SEO",
  "version": "0.1.7",
  "description": "Fast, private on-page SEO data, exports, schema, links, images, and SERP previews for working SEOs.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "Shumway SEO Toolkit",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "contextMenus",
    "downloads",
    "storage",
    "webRequest",
    "webNavigation"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content/redirect-detector.js",
        "content/web-vitals-collector.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; img-src 'self' http: https: data: blob:"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "shumway-seo@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}