Examine source code of Flashcard Reminder

{
  "manifest_version": 2,
  "name": "Flashcard Reminder",
  "version": "1.0",
  "description": "Show flashcard reminders during break time.",
  "permissions": [
    "alarms",
    "storage",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ba4f12e7-2bf1-433f-9908-d6c475471e01}"
    }
  }
}