As people have said containers is amazing. But in the scenario where you really need 2 completely separate browsers and don’t want to use different operating system accounts (I’ve done this in the past).This extension has worked well for me https://addons.mozilla.org/en-US/firefox/addon/profile-switcher/ It’s not ideal that it’s an extension but it does do its job
Never got on board with email but the pages functionality is amazing and doesn’t exist anywhere else (at least with e2e and real time collaboration). Not sure where I’m going to go