Examine source code of Mirror icon

{
  "manifest_version": 2,
  "name": "Mirror icon",
  "version": "1.0",
  "description": "Mirror icons often appear in beauty apps, makeup apps, or in designs related to self-care.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Click me!"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{95f9072c-b0a0-40cb-b761-9dfe96689998}"
    }
  }
}