Examine source code of Blocknative Gas Estimator

{
  "name": "Blocknative Gas Fee Estimator for ETH & MATIC",
  "description": "Get into the next block without overpaying with the most reliable and accurate Ethereum and Polygon Gas Estimator extension.",
  "version": "0.7.6",
  "manifest_version": 2,
  "icons": {
    "48": "icons/bn-logo-chrome-48.png",
    "128": "icons/bn-logo-chrome-128.png"
  },
  "background": {
    "scripts": [
      "build/background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ],
  "optional_permissions": [
    "notifications"
  ],
  "content_security_policy": "script-src 'self' https://www.google-analytics.com; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{9188f4a5-fef2-43ef-a38b-9f2b965daccf}"
    }
  }
}