I have at least two computers I use on a daily basis, one at work and one at home. I use Firefox on both computers. I have always used the Firefox extension Bookmarks Synchronizer to synchronize my bookmarks to my personal FTP server, so that I can access them from work and home. When I upgraded to Firefox 1.5, the extension stopped working. I have been searching for an alternative ever since.
Recently, I found an extension called Foxmarks Bookmark Synchronizer. Basically, it performs the same functions as the older Bookmarks Synchronizer but it is much better because:
For all the above reason, I highly recommend this extension. I have been using it for a couple of weeks now and, so far, it works as advertised (even though it is still in beta).