https://addons.mozilla.org/en-US/firefox/addon/temporary-con...
But now, well, I don't really see me going back any time soon.
The bridge solution is a nice attempt at supporting open standards, but it's not on Linux or Android which basically means my email is silo-ed. I can't use it with my regular mail client and the ProtonMail client will never be all things to everybody.
The android client at least does seem to run just fine without Play Services, it just pops up annoying notifications saying it needs them.
At this stage I'm probably looking at migrating away.
I'd really like a mail provider that lets me forward a few addresses to the rest of my family since I own lastname.nz, but that doesn't seem possible on most mail hosts without a full x-user enterprise setup.
Edit: fixed link
If I had to guess, I suspect that Firefox triggers the container switch dialog on the first network request, and that page is so optimized that after the first visit it loads entirely from cache and/or localstorage data without any network activity at all.
If true, it might be that while it didn't switch, it actually wasn't leaking data between containers at all, since there was no network activity. I'm not sure if a background request would have triggered a container switch dialog, been blocked quietly, or have been allowed through some root page permissions cascade.
I may be far off, and this is trivially checkable, but I'm out of time.
You can try this if it affects you.
I also made the switch to Bitwarden - except for me I was using Lastpass before. Bitwarden has a much cleaner interface and a sane sharing scheme. Trying to keep shared passwords in sync with my wife in Lastpass was an absolute nightmare - to the point that I hated changing the passwords - which is one of the major points of a password manager. Lastpass has become stagnant and bloated since LogMeIn bought it.