Okay, I got good news
Good News:
If you have a Content page you can tell the that page that what master page to load on different browsers. Its pretty simple take a look at the code below:
<%@ Page Language="C#" mozilla:MasterPageFile="~/Mozilla.master"
ie:MasterPageFile="~/MyMaster.master" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %>
As you can see in the above code ie represent Internet Explorer and mozilla offcourse means Mozilla browser.
powered by IMHO