Examine source code of GoodPlan

{
  "name": "GoodPlan Notes",
  "short_name": "Nice-looking digital smart notebook with daily pages",
  "manifest_version": 2,
  "description": "Replace a new tab with daily smart notes",
  "version": "1.0.2",
  "incognito": "spanning",
  "homepage_url": "https://goodplan.app/",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "16": "favicon/GoodPlan_in_16px.png",
    "32": "favicon/GoodPlan_in_32px.png",
    "48": "favicon/GoodPlan_in_48px.png",
    "128": "favicon/GoodPlan_in_128px.png",
    "512": "favicon/GoodPlan_in_512px.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_action": {
    "default_title": "GoodPlan Notes",
    "default_icon": {
      "16": "favicon/GoodPlan_in_16px.png",
      "24": "favicon/GoodPlan_in_24px.png",
      "32": "favicon/GoodPlan_in_32px.png",
      "128": "favicon/GoodPlan_in_128px.png"
    }
  },
  "permissions": [
    "storage",
    "identity",
    "geolocation"
  ],
  "background": {
    "scripts": [
      "lib/jquery.min.js",
      "lib/moment.min.js",
      "common.js",
      "background.js"
    ],
    "persistent": true
  }
}