Examine source code of Wired network icon

{
  "manifest_version": 2,
  "name": "Wired network icon",
  "version": "1.0",
  "description": "The wired network icon is commonly used to represent an internet or internal network connection via a physical cable, such as an Ethernet cable.",
  "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": "{5b86dabd-dbf3-46c4-b48b-7bb695c6dc1f}"
    }
  }
}