Examine source code of Wake up icon

{
  "manifest_version": 2,
  "name": "Wake up icon",
  "version": "1.0",
  "description": "Wake up symbols are often visual representations of waking up, alarm clocks, or starting the day.",
  "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": "{23616e7d-715d-45f3-a702-1e05aaa1d040}"
    }
  }
}