Examine source code of Print History King

{
  "name": "Print History King",
  "version": "2.1.2",
  "description": "Reads and displays your recent print history, providing you a convenient way to track and organize printing activity.",
  "permissions": [
    "printingMetrics",
    "storage"
  ],
  "browser_action": {
    "default_popup": "printJobs.html",
    "default_icon": "print.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{b6fe2b11-38ee-4359-943c-55901814bd19}"
    }
  }
}