I don’t think you need a guide. Just install the extension and give it a try. It’s pretty simple and intuitive.
still no possibility to set default container for Ctrl + T
It might be possible now, you could give it a try. But anyways, I don’t see how changing the default container for new tabs could be useful. There is a default container which is the “no container”, why would you want to change it?
EDIT: yes, it is possible now.







Looks like your wife is lucky.
https://www.protondb.com/app/1034860
https://www.protondb.com/app/47890
https://github.com/bvschaik/julius