I love Mozilla for how they wrested web browser control form IE6 back in the day, but I just cannot go back to Firefox after becoming a @Vivaldi power user. Being able to combine workspaces with tabstacks to create multidimensional organization of my tabs is game-changing. Eg; I have a research Workspace which currently has a tabstack for Wez's Terminal and another one for #Python and Sigstore. By combining features neither stacks nor workspaces get too messy