Examine source code of GTmetrix Analyzer GM

{
  "manifest_version": 2,
  "name": "GTmetrix Analyzer",
  "version": "1.3",
  "description": "Quickly analyze the performance of any webpage using GTmetrix API.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "https://gtmetrix.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "GTmetrix Analyzer"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{44d15b67-fad4-4033-857a-95b7781ba85e}"
    }
  }
}