Obviously, foxmarks was made for FireFox. Would it be possible to update Opera bookmarks? Downwards is more than enough. A widget could download a html-file and import it into Opera. The full usability would be too amazing.
I simply use Opera on my mobile devices and my Tablet...the main work is happening in FF: However, it is a pain to copy&paste the file once a week.
Actually, it would fill a big hole in the Opera services too. It would satisfy and make many users happy!
PS: Great page btw.