I heard that you can put the tabs under the bookmarks bar using the terminal on OS X, but I don't know if you can do it on Windows.
It's very fast. It actually makes a difference. I wish Firefox were this fast. ;o;
I might start recommending this to people that don't need add-ons. I usually reccomend Chrome for it's speed, but this is faster, so ~
the tabs aren't much of an issue, and perhaps VS support would be better after it's out of beta. I never really customized FF much, so I may just use Safari.
And yeah, it's quite noticeably faster, RMRK loads in a fraction of a second for me in Safari, where it'd take a second or two in FF. Every page, every time, it does get kinda annoying when you work faster than you computer
Oh yeah, the adblocker clears the ads, but doesn't collapse the frames, which is a partial solution, but not entirely.
edit: wow, my cpu usage with Safari up is really erratic, everywhere from 2% to 91% idle
and it uses a LOT of RAM.