Examine source code of Simple Chart Maker

{
  "manifest_version": 2,
  "name": "Simple Chart Maker",
  "version": "1.0",
  "description": "Create simple charts from user input using Chart.js.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Simple Chart Maker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8cedf3b8-9736-4aa4-b6d0-8e3e63e27d80}"
    }
  }
}