[regexnerd]

I don't use anything but web mail (Fastmail) since 2002. I do my banking and email in one browser and my general browsing in a very locked down Firefox (Many about:config hacks, uBlock Origin, Decentraleyes, Webmail Ad Block, Privacy Badger, and No Coin) that blocks about everything save the actual content. I also run a Pi-hole. Keeping your actions compartmentalised keeps your privacy better controlled. Nothing is perfect, but keeping things separated is generally a better idea than not doing so.

[tehmaco]

If you're not aware of it, you might want to look into Qubes[0], it's an OS that uses virtualisation tech to compartmentalise applications from each other (and the host OS). So you can use your browser of choice for all uses, just in different VMs configured to retain/discard data as you want.

[0] https://www.qubes-os.org/