Examine source code of MultiSearch Pro

{
  "manifest_version": 2,
  "name": "MultiSearch Pro",
  "version": "1.0",
  "description": "Simultaneously search multiple engines and compare results",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "MultiSearch Pro",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d514b237-ca99-4cd5-8ba9-e6abaf89f239}"
    }
  }
}