file open in new tab in mozila

Hi all,

I am using this this code :

flnm = "WriteReadData/documents/" + doc;

string fullURL = "window.open('" + flnm + "', '_blank', 'height=1000,width=1500,status=yes,toolbar=yes,menubar=yes,location=yes,scrollbars=yes,resizable=yes,titlebar=yes' );";

ScriptManager.RegisterStartupScript(this.Page, typeof(string), "_blank", fullURL, true);

this code open in new tab in chorme so good but this code open in popup window in mozila so not good ,i want open in new tab in mozila, how to solve this problem .please guide me

Thanks