Examine source code of Distraction Logger

{
  "manifest_version": 2,
  "name": "Distraction Logger",
  "version": "1.0",
  "description": "Log each time you get distracted by visiting non-work sites.",
  "permissions": [
    "tabs",
    "storage",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Distraction Logger"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{31a4d9e8-cd13-4a8c-94b3-11379c6396b6}"
    }
  }
}