Examine source code of iGP Extended

{
  "manifest_version": 2,
  "name": "iGP Extended",
  "description": "Enhance your iGPmanager experience",
  "version": "0.994",
  "icons": {
    "128": "./images/racing128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icons": {
      "128": "./images/racing128.png"
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "scripting",
    "*://igpmanager.com/*",
    "*://api.open-meteo.com/*",
    "*://docs.google.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6782657b-7bf7-4152-8eb4-a32bbc822aa8}"
    }
  }
}