"Maybe you lack imagination" - maybe you lack computer skills, it certainly seems so. There are plenty of ways you could avoid having 100 tabs open. However, if you feel like that's something you need then stop whining and buy a machine with enough RAM for your usual use case.

the ideal number of tabs roughly corresponds to the human stack size, plus a couple for on-going apps like gmail. If you need more than that, you should consider a better mechanism than the browser. Since you haven't found any, I posit that its you who lacks imagination. If you found my comment insulting then I am sorry.