Ummm, you do realize that Netscape is built on Mozilla? I have not found any site that supports Netscape, limiting access to my Firefox.
Have you actually tried using Firefox on your bank site, or did you just take their supported browsers at face value? I access both BankOne/Chase and Nat.'l City websites just fine with Firefox.
I have tried using Firefox on my bank site. It gives me a message that the browser is not supported.