Examine source code of tecch screenshot

{
  "name": "Tecch Screenshot Extension",
  "version": "1.4",
  "description": "With Tecch Screenshot demonstrate screenshot functionality in the chrome.tabs api.",
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "camera.png",
    "default_title": "Take a screen shot!"
  },
  "permissions": [
    "activeTab"
  ],
  "manifest_version": 2
}