Examine source code of Random Color Popup

{
  "manifest_version": 2,
  "name": "Random Color Popup",
  "version": "1.0",
  "description": "Generate and display a random color in popup.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png",
    "default_title": "Random Color"
  },
  "permissions": [],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{83b8f4b1-f7b1-4a43-9693-68e9257f61de}"
    }
  }
}