[Robert A Cook PE]

I switch back to IE load the bank's software/billpay. It doesn't "answer" mozzila's replies properly.

[Hank Rearden]

There's at least one FF extension that causes FF to mimic Exploder's ID; that may enable those sites to work.

If it were me, I'd bitch to the site programmers to fix their nonstandard, possibly insecure, code.

[Uncle Fud]

There is a Firefox extension called "ieview" at http://ieview.mozdev.org/ which solved this problem for me. Lets you shell out to IE to re-load the currently browsed site and drop right back to Firefox when finished.