Examine source code of Delayed Click

{
  "manifest_version": 2,
  "name": "Delayed Click",
  "description": "To trigger a click after custom timeout",
  "version": "0.2.1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentscript.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{eba05028-5be4-4ed4-9d6c-0ea38d63927c}"
    }
  }
}