Examine source code of BJPrint

{
  "name": "BJPrint",
  "description": "Adds a instant print button in your browser.",
  "version": "1.0",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "BJPrint",
    "default_icon": "16.png"
  },
  "manifest_version": 2
}