"optional": true,
                "description": "Include search shortcuts appearing on the Firefox new tab."
              },
              "newtab": {
                "type": "boolean",
                "default": false,
                "optional": true,
                "description": "Return the sites that exactly appear on the user's new-tab page. When true, all other options are ignored except limit and includeFavicon. If the user disabled newtab Top Sites, the newtab parameter will be ignored."
              }
            },
            "default": {},
            "optional": true
          },
          {
            "name": "callback",
            "type": "function",
            "parameters": [
              {
                "name": "results",
                "type": "array",
                "items": {
                  "$ref": "MostVisitedURL"
                }
              }
            ]
          }
        ]
      }
    ]
  }
]
PK