Examine source code of Toggle Debug Mode

{
  "manifest_version": 2,
  "name": "Toggle Debug Mode",
  "version": "0.3",
  "icons": {
    "64": "icons/icon-64.png"
  },
  "description": "Toggle Debug Mode",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_area": "tabstrip",
    "default_icon": "icons/icon-64.png",
    "default_title": "Toggle Debug Mode"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}