There is still a point with dillera's method since it can be automated. I would really like to sync the bookmarks with my other computers regularly.

I wrote a small script to do the conversion. The problem is that the 770 bookmark manager is very shaky, even if I use the built in import feature. The import usually succeeds but if I try to add or delete some bookmarks the whole list disappears every third time or so. Mind you, my bookmarks.html file for Mozilla is almost 700k.