Totally agree. TST was the primary reason I stuck with FF for so many years, even when Chrome was faster and more broadly compatible.
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.
As a tab collector - who often needs to open +1 Chrome windows full of tabs - the best solution to my tab management needs has been the "Vimium" extension. Sure, it's not a tab manager, but with home-row key bindings, I can easily switch to different tabs. I have used Chrome's groups feature too, but that requires more mouse clicking and doesn't support keyboard shortcuts. For me, the main criterion in choosing a piece of software is the keyboard shortcuts it supports. More keyboard is usually better.
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.
Session Buddy has been very helpful for me also! I can get dozens of tabs out of my face in seconds if I need to really focus on one or three things exclusively.
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).
Not sure what to tell you... If I remember correctly, the last time I restarted Firefox was to update it, around the 5th of May (I have version 76.0). Generally speaking I don't restart it (or the laptop) except for that.
No addons other than uBlock Origin, TST and LastPass.
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.