Booky might work well for people with smaller bookmark collections. I have around 2500 in Firefox. Booky was able to handle the large import but did have a couple problems. 1) Apparently nested folders are only supported 2 levels deep. No folders were lost, but all the lower levels were intermingled. 2) In cases where I had a folder containing a mix of subfolders and individual bookmarks, Booky created a new subfolder with the same name as the parent folder, and moved the individual ones into it.

Also, there appears to be no way to sort your bookmarks, other than by dragging them individually.

The search interface is much nicer than native Firefox.