Examine source code of Daily Reminder

{
  "manifest_version": 2,
  "name": "Daily Reminder",
  "version": "1.0",
  "description": "Set and view a daily reminder.",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/reminder-48.png",
    "default_popup": "popup.html",
    "default_title": "Daily Reminder"
  },
  "icons": {
    "48": "icons/reminder-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5672497d-b1a0-441f-9a6b-ec3845870c4d}"
    }
  }
}