Examine source code of URL Scheduler P+

{
  "name": "URL Alarm Scheduler",
  "version": "1.0",
  "description": "Set alarms to automatically open designated URLs at specific times, ensuring you never miss important webpages",
  "permissions": [
    "alarms",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "scripts.js"
    ]
  },
  "manifest_version": 2,
  "options_ui": {
    "page": "options/setAlarm.html",
    "browser_style": true
  },
  "browser_action": {
    "default_title": "URL Alarm"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dbf8b239-bdce-488f-8d13-ada07b014673}"
    }
  }
}