Examine source code of Beginner Icon

{
  "manifest_version": 2,
  "name": "Beginner Icon",
  "version": "1.0",
  "description": "The beginner icon is often used to indicate a new user, student, or member who is at the beginning of a learning, career, or skill journey. Depending on the context, this icon will have different images.",
  "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": "{6ee0cc91-de52-4c53-ba1e-76f7f78d1a68}"
    }
  }
}