It's massively hyped by that one tik-toker. The downsides with using this is that it makes your browsing space smaller. In addition, if you're an impulsive person and accidentally close one browser, then you can wave ALL those tabs gone because your never going to get them back. Also it's a massive hassle to group tabs like this, but the upside is that its easy to keep control of tons of tabs.

Very nice, except I would wish that one feature was added: Opening a whole tree in container tabs, or otherwise being able to collapse a tab tree in the tab bar on top.

Good

It saves users' time efficiently

Poor optimization and doesn't even remove the top bar so it's making things worse.