Examine source code of Design Mockup Helper

{
  "manifest_version": 3,
  "name": "Design Mockup Helper",
  "version": "1.0",
  "description": "Easily create and manage design mockups with tips and visual guidance.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "design-mockup-helper@example.com"
    }
  }
}