It seems silly that they would have “invented” a tool for tab hoarders that is obviously less useful than a thing that already exists and is currently not available on Chrome.
Another feature which I like is tab pinning. It's esp. useful if you're playing/running something in the background (YT music, Jupyter notebooks, etc.)
Finally, I tend to use "session buddy", which is another extension that saves the current state of tabs. I can save them and quit Chrome. Later, if I'm looking for a certain tab, I can just search for it in session buddy's saved sessions.
It's not super often that I go back through the tabs I store, but the peace of mind of knowing where they are is wonderful. I used to do this with text files (shudder).
All in all, ~450 opened tabs in 6 different containers.
Firefox is using ~8% of CPU and 670MB of RAM. Macbook Pro retina mid 2012.
No addons other than uBlock Origin, TST and LastPass.