Examine source code of Auto Close Tab on Error

{
  "manifest_version": 2,
  "name": "Auto Close Tab on Server Not Found",
  "version": "1.0",
  "description": "Automatically close the tab if the title is 'Server Not Found'.",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    },
    "default_title": "Auto Close Tab"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f098e49e-d12f-4093-bd76-bf7c5ecf3db2}"
    }
  }
}