Workona tab manager does most of that for free. It doesn't have split screen, but it has better bookmark management.

Without personal discipline, niether of them solve my real problem of tab diahria as I go down 6 nested rabbit holes trying to solve multiple problems, some which do get solved, and some need exploring later, some which need to be archived.

Please, for the love of God ditch messaging. I don't need 1 more place to get a message from someone. If they are too lazy to copy pasta a link, I don't need to see it.