Examine source code of DailyFocusTab

{
  "manifest_version": 2,
  "name": "Daily Reminder New Tab",
  "version": "1.0",
  "description": "Displays a daily reminder on the new tab page.",
  "permissions": [
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "background": {
    "scripts": [
      "newtab.js"
    ],
    "persistent": false
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e471af6b-a6d9-47bf-b7de-fbb5a715f371}"
    }
  }
}