Are these Windows-specific modifications, or tuning Firefox settings that might be beneficial on other platforms? (I'm not saying that I'm looking at the insane UI changes for the upcoming Safari release on the Mac and investigating other options, but I'm not not saying that.)
You and everyone else. I'm just taking a wait-and-see approach, on the off chance the new tab categorization stuff makes the new design usable. Otherwise, I'll have to trade a couple hours of battery life and some overall system performance and switch to... something else. Probably FF or a light alternative Webkit browser. Hell, there's hardly a task I do that doesn't put me at at least 10 open tabs, which is already too many for the new design, then if someone comes along and says "hey can you take a look at X real quick", well, now I might be at or over 20 (I find multi-window browsing horribly obtuse unless I have 3+ monitors). And you know what? I'm not always great about closing all my tabs the second I finish a task, and I don't really want to have to do that.
We'll see how it works, but I'm not optimistic. It looks batshit crazy. I can imagine something involving a highly-capable quick-search-to-find-tab system making it better than what we have now, or at least not-worse, but dunno whether they'll be including anything like that.
I don't want to save tabs, I just need them to be separated in arbitrary and temporary visual groups. Makes management so much easier when i can just switch to another group and hide the 25 tabs i had open while researching a problem.
I can't even think to work without this thing.
EDIT: "increase" in the sense of "make better". Whoops.