Examine source code of Auto Refresh A

{
  "manifest_version": 2,
  "name": "Auto Refresh A",
  "version": "1.1",
  "description": "Automatically refresh the page every 60 seconds.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Auto Refresh"
  },
  "icons": {
    "48": "icons/refresh.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{18ccc141-87c6-4dae-b6fa-b4f2647cbd45}"
    }
  }
}