Examine source code of Password Reminder

{
  "manifest_version": 2,
  "name": "Password Reminder",
  "version": "1.0",
  "description": "Reminds you to change your passwords periodically.",
  "permissions": [
    "storage",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8fd1c19a-6071-4753-81b8-201f89fc5c68}"
    }
  }
}