If I could have tab stacking back... in ANY browser... I would switch to that browser in an instant. I am no longer using Opera because this feature is gone.

Organization is a factor in productivity. Now there is no intuitive method for personalized organization anymore. Chrome has some strange stacking thing, but that just is a sorter to pull your most recent tabs forward. I don't need my computer to attempt organization for me. I want to do it my way. This is why tab stacking was fantastic. Keep all your thoughts in one place with ease. Separate your thoughts (tabs) into obvious categories. Hold onto your baskets of thoughts (tabs) for as long as you need them. But no, now you just take my lovely baskets and flip them over on the ground. Everything in a mess again for me to sort through. In my opinion that is the one feature that ALL browsers should have. It shouldn't even be hard to implement....