Examine source code of Eye Break

{
  "name": "Eye Break",
  "description": "A simple application to remind you to give your eyes a break",
  "version": "0.0.1",
  "manifest_version": 2,
  "permissions": [
    "notifications",
    "storage",
    "alarms"
  ],
  "homepage_url": "https://jimmyli.us",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Eye Break",
    "default_icon": {
      "48": "logo48.png",
      "96": "logo96.png"
    }
  },
  "icons": {
    "48": "logo48.png",
    "96": "logo96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dfcdf09c-46cd-46d7-9634-95b964420994}"
    }
  }
}