"Except I'm working just fine without one." Does the expression "your mileage may vary" ring a bell? I don't see the great utility of "tabbed" browser windows in Firefox. I prefer multiple windows. Other people disagree. As they say, 'whatever blows your skirt up.' In my experience, Windows does not recover memory as aggressively ow with much control as you can achieve with a good utility app. I would not presume to suggest that my experience is definitive or all encompassing.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken