Examine source code of Breathe Reminder

{
  "manifest_version": 2,
  "name": "Breathe Reminder",
  "version": "1.0",
  "description": "Remind yourself to breathe and relax regularly.",
  "permissions": [
    "notifications",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4ebb2947-e812-4897-9936-0309bc958973}"
    }
  }
}