...and a teller won't/can't do anything about it and this will change nothing. Maybe leave your keyboard for a second and understand how the world actually works.
Unless you have billions at a bank, I don't see why any bank would even consider changing how their website works because of a single customer. And, well, real billionaires probably don't care about not being able to use a website on Firefox.
>>o1y32+(OP)
A single customer might not have any effect, but if many of them do the same, it could. Don't give up just because your individual contribution is negligible.