Examine source code of DevProxy Virtual Hosts

{
  "manifest_version": 3,
  "name": "DevProxy Virtual Hosts",
  "version": "1.0.3",
  "description": "Chrome extension for listing local sites served by devproxy",
  "browser_specific_settings": {
    "gecko": {
      "id": "devproxy@dontfreakout"
    }
  },
  "permissions": [
    "storage",
    "notifications"
  ],
  "host_permissions": [
    "http://localhost/*",
    "https://localhost/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "DevProxy Virtual Hosts",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}