Examine source code of Auto Tab Refresher

{
  "manifest_version": 2,
  "name": "Auto Tab Refresher",
  "version": "1.0",
  "description": "Automatically refreshes your current tab at a chosen interval.",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png",
      "64": "icon.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png",
    "64": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2ffaeba5-8aa3-4594-87a1-0624d46c6e20}"
    }
  }
}