For today's browser tip, David Chartier over at TUAW points us to Bookmarks Synchronizer. Bookmarks Synchronizer is an extension for Firefox that, like similar functionality in Safari and .Mac, keeps your bookmarks in sync over many different machines. It does this by uploading your bookmarks via FTP/WebDAV. You can set it to sync when you start or quit Firefox, or only when you want to, and it's cross-platform so it's easy to keep your Windows machine and your Mac in sync.