It is really hard to replicate Vivaldi's workspace or stacked tab features in Firefox. I know some have had good luck with replicating the stacked tabs with extensions I personally don't think it's the same. Floorp tries to implement workspaces but it's implementations is lacking. I can't remember if Pulse browser has this feature or not. Good luck.

Yes, good 'ol Slackware I had a Vector Linux period!!

I forget they sell appliances.

Gotcha!

Doesn't Yattee do this also?

AllSides