Examine source code of Vision Saviour

{
  "manifest_version": 2,
  "name": "Vision Saviour",
  "description": "Protect Your Eye Vision with 20-20-20 Rule",
  "version": "1.0.0",
  "icons": {
    "128": "icon_128.png"
  },
  "permissions": [
    "activeTab",
    "notifications",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Vision Saviour : Protect Your Eye Vision with 20-20-20 Rule"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  }
}