Examine source code of Classroom icon

{
  "manifest_version": 2,
  "name": "Classroom icon",
  "version": "1.0",
  "description": "The classroom icon is a modern learning space where students and teachers connect – learning anytime, anywhere, in an easy and effective way.",
  "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": "{c9b51962-4cae-4129-aca5-641f800e10be}"
    }
  }
}