That’s an interesting extension. It does work. But when I disabled both, and then reinstalled Firefox, it STILL didn’t work. Crazy. At least I have a workaround, thanks for that!
Wondering if my systems picked up some flakiness… 
Since it works in multi-container, my guess is there is a cache / cookie / something that is impacting logging in.
On a different note, the multi-account container works really well:
- You can force a specific site to open in a specific container
- If you have multi-accounts from the same provider (e.g., multiple gmail accounts) you can force each account to open in a different container, which makes using multiple accounts from the same provider really easy
I read that in the description, and that could be useful. It’s like ‘sand boxing’ on macOS. Sort of like a virtual machine idea, without the overhead.
AND, it’s not working again. Good grief!! So tired of this…
It’s just looping back to the login page with a different background.