Examine source code of CD Icon

{
  "manifest_version": 2,
  "name": "CD Icon",
  "version": "1.0",
  "description": "The CD icon is usually a circle, sometimes silver or rainbow in color – used to represent content, equipment, or actions related to using a CD.",
  "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": "{d0bef420-c64b-493c-9f0e-fe57fec09745}"
    }
  }
}