Yep, same problem. Firefox hangs whenever I try to do anything "intensive" with Places, such as selectively deleting stuff from the history or reorganizing a large number of bookmarks. It's gotten much better than before, though.

Weird thing is, Firefox is still faster than Chrome on my computer (Win7x64). I don't know what's wrong with my computer, but Chrome is noticeably slower than Firefox in day-to-day use. This only happens on this particular computer. Chrome is indeed faster in every other computer I've tried. Very strange.