Lack of money, I couldn’t afford to pay for a Windows license. After discovering how to install Linux more than 25 years ago, I became eager to learn it and never looked back.
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.