Examine source code of Wattspeed

{
  "manifest_version": 3,
  "name": "Wattspeed",
  "version": "5.0.0",
  "description": "Wattspeed is a browser extension that offers powerful web performance insights and CrUX data each time you open a new web page.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{94ef9b4a-277d-464b-93c2-e1ae67de5adc}"
    }
  },
  "icons": {
    "16": "assets/icons/icon-16.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "action": {
    "default_icon": "assets/icons/icon-48.png",
    "default_popup": "index.html",
    "default_title": "Wattspeed"
  },
  "permissions": [
    "tabs",
    "scripting",
    "activeTab",
    "storage",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ]
}