I'm also using Focus (Klar, for DE/AT/CH countries - with telemetry disabled by default) as a default browser and combining it with Firefox Lockwise makes it easy to login somewhere temporarily.
But don't feel too safe with it re: tracking, because there's browser fingerprinting that works without cookies: https://panopticlick.eff.org/
On android, Firefox beta (and maybe stable; haven't used stable in a while) allows you to have bookmarks as well as open all links in a private tab by default.
On desktop I use multi account containers and wipe history on exit, and have a handful of bookmarks for convenience.
For both, I use the bitwarden add-on/app to manage passwords.
Honestly a browser which kept no history but could let me save bookmarks and manage logins (either via a third party app or natively) through a walled garden would be great. Not sure if managing passwords without accumulating tracking cookies is even possible.