I'm on Aurora right now (15a2), and after YEARS of bitching am cautiously optimistic this is really it!

Just a few weeks ago I was closing FF once a twice a day as it approached almost a GB of RAM. Now it's holding steady at under 230mb! I have few extensions, but use firebug. I knew it was part of the problem but it's unfortunately essential for me.

With this fixed perhaps they can now work on tab isolation, another of their last major issues, (instead of rearranging the interface again).