Examine source code of Radio icon

{
  "manifest_version": 2,
  "name": "Radio icon",
  "version": "1.0",
  "description": "Wall radio symbol for listening to music, radio dramas, audio stories, comedy shows.",
  "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": "{ed5c7cbb-7b4d-4b7b-a01c-ca9b5c0e3b48}"
    }
  }
}