synchronizing bookmarks between Safari and Firefox

are there any programs that let you automatically synchronize your bookmarks between safari and firefox? i hate how when you bookmark a page in one browser it doesn't automatically bookmark it on the other one.

if you have bookmarks in the bookmarks bar, then it asks you if you want to duplicate it in your new browser. for the bookmarks, im not sure.

yeah it did that when i first installed firefox, but i was hoping that it would continue to automatically synchronize my bookmarks since i use both browsers.

Bumping because I want to know this, too.
I usually use Firefox, but I'm playing a bit with Safari now too. It'd be great if I could somehow import my bookmarks from FF.