This makes no sense. I, like many people here use a Mac and Chrome and can't remember the last time it crashed. I suspect this is something specific to your installation, possibly a rogue plugin you've installed.
My experience is quite the opposite to yours. neither ff or chrome crash much, and chrome is significantly faster.
On my system -- and I've tried everything I could think of, including blowing away my profile -- it's slow, crashy, and hangs a lot. It's a newish Macbook Pro with plenty of disk and RAM.
FF, on the other hand, is faster (!) and doesn't crash often.
My experience is quite the opposite to yours. neither ff or chrome crash much, and chrome is significantly faster.