Examine source code of Display Port Icon

{
  "manifest_version": 2,
  "name": "Display Port Icon",
  "version": "1.0",
  "description": "The display port icon is a visual representation of the ports that connect video signals from one device to another (such as from a computer to a monitor).",
  "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": "{d162e580-2641-4e1f-acbf-635d8e0b9884}"
    }
  }
}