Examine source code of CPU Info

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "CPU Info",
  "version": "1.0.0",
  "description": "Shows details about your CPU!",
  "permissions": [
    "system.cpu"
  ],
  "action": {
    "default_title": "CPU Info",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icon.png",
    "32": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "options_page": "popup.html"
}