Examine source code of LinkBuilder: Check Link Price

{
  "manifest_version": 3,
  "name": "Check Link Price by LinkBuilder.com",
  "version": "1.0.23",
  "description": "See how much a backlink from any website costs — live guest-post prices, right in Google search results.",
  "icons": {
    "16": "icons/regular/16.png",
    "32": "icons/regular/32.png",
    "48": "icons/regular/48.png",
    "128": "icons/regular/128.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/search*"
      ],
      "js": [
        "src/content/google.js"
      ],
      "css": [
        "linkbuilder-extension.css"
      ]
    },
    {
      "matches": [
        "*://app.ahrefs.com/site-explorer*",
        "*://www.semrush.com/analytics/*",
        "*://semrush.com/analytics/*",
        "*://moz.com/domain-analysis*",
        "*://www.moz.com/domain-analysis*",
        "*://analytics.moz.com/pro/*",
        "*://majestic.com/reports/*",
        "*://www.majestic.com/reports/*",
        "*://serpstat.com/domains/*",
        "*://*.serpstat.com/domains/*"
      ],
      "js": [
        "src/content/seo-overlay.js"
      ],
      "css": [
        "linkbuilder-extension.css"
      ]
    },
    {
      "matches": [
        "https://app.linkbuilder.com/extension/auth-success*"
      ],
      "js": [
        "src/content/auth-callback.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://app.linkbuilder.com/*"
      ],
      "js": [
        "src/content/google-auth-callback.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/regular/*.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "scripts": [
      "src/background/background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_title": "LinkBuilder",
    "default_popup": "src/pages/popup/popup.html",
    "default_icon": {
      "16": "icons/regular/16.png",
      "32": "icons/regular/32.png",
      "48": "icons/regular/48.png",
      "128": "icons/regular/128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "check-link-price@linkbuilder.com",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "websiteActivity"
        ]
      }
    }
  }
}