Examine source code of Google Maps Timeline Export

{
  "manifest_version": 3,
  "name": "Free Google Maps Timeline Export to Excel",
  "version": "0.1.7",
  "description": "Export your trips and mileage from Google Maps Timeline to Excel for your mileage tax deduction.",
  "action": {
    "default_title": "Open Free Google Maps Timeline Export to Excel"
  },
  "icons": {
    "16": "assets/icons/google-maps-16_16.png",
    "32": "assets/icons/google-maps-32_32.png",
    "64": "assets/icons/google-maps-64_64.png",
    "128": "assets/icons/google-maps-128_128.png"
  },
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "optional_permissions": [
    "downloads"
  ],
  "host_permissions": [
    "https://timeline.google.com/*",
    "https://*.google.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2BF1C24C-CE32-48CE-A3EC-7B281CA253C4}"
    },
    "safari": {}
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  }
}