Examine source code of Product Management Icon

{
  "manifest_version": 2,
  "name": "Product Management Icon",
  "version": "1.0",
  "description": "Product management icons often represent ideas about: Product, Management, adjustment, control,Inventory or tracking.",
  "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": "{b3c07b6b-d99c-45c6-9ab6-5fac677bc112}"
    }
  }
}