Granted, you could have multiple tasks ongoing in parallel, but are you really working in parallel at that point? If not, save the tabs and return to them later. I really doubt you are visiting all 100 tabs on a regular basis so as to merit they stay open at all times.
I've seen way too many people use their browser as a sort of todo app, by virtue of "I'll open a tab for this so I don't forget to do it later" -- hell, I do this too -- but that's not at all the intended usage of a browser, and so naturally, it sucks at it.