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Hi....
What is the "back button" ??
Is it a button control on your webbrowser?? or It is UI Control (simply drag and drop) i.e. <asp:Button ID="btn1" runat="server" text="click"/>
If it an asp:Button, simply write the following code for redirection -
Response.Redirect("Default2.aspx"); // Name of Page.
If the issue is with Web Browser, simply unistall Firefox from Control Panel and use the latest version of it. Firefox 20.
Hope this helps you out.