For better multi-account container support, you might want to look at Sidebery instead of Tree Style Tab.
Relevant talk by Jon Skeet
https://invidious.io.lol/watch?v=64X8rCy1jSA
It doesn't sound like he's been convicted of a crime yet...
For better multi-account container support, you might want to look at Sidebery instead of Tree Style Tab.