I changed bank - I had an account with a bank (RBS?) in the late 90s / early 00s, couldn't access it from linux, yet I could access HSBC, so RBS lost my custom.
My current bank (Smile) works in Firefox on linux, so that's fine. If it didn't, they'll be losing my custom.
Sometimes I am astonished by the life other people apparently lead. For example when they'd invest the energy to switch their bank (and all that is attached to that) over using a different browser to access a singular website.
I do not understand. It boggles my mind, in the most curious way.
Sometimes the way it fails gives the impression of a less-than-comfortable level of competence with technology. I also almost switched banks when my first was acquired by another, its webui was so much worse.
My current bank (Smile) works in Firefox on linux, so that's fine. If it didn't, they'll be losing my custom.