Googling led me to this page where the author had the same problem, and they found a solution in Safari Bookmarks Extractor. I can't test that it still works with version changes in both, but it probably does. Once you have your extracted bookmarks, you just use Manage Bookmarks -> File -> Import -> From File.
I do Folding@Home (with a different group, sorry), and I recently discovered that I had a unit that wouldn't send for two weeks straight. Researching, I discovered that the version I was using (5.03 or something) was pretty outdated. Apparently 6.