You are implying that sensitive financial websites should be visited using a more secure browser than other websites. That doesn’t make much sense, because the financial websites are actually more secure, so your choice of browser or privacy rules makes little difference.
Security and privacy-minded people should be using a hardened browser for everything, but especially so for non-financial websites, because those are the sites that lack security and sell your data to the highest bidder.
There are a few bullet points in my privacy thread related to web browsing.