Hi guys. I can confirm the rss feed is no longer working. More precisely, it is working, but because this is an ancient module for phpbb 2.0 which spits out ancient RSS2.0, Firefox Live Bookmarks no longer understands it. It also doesn't work in the Liferea feed reader, incidentally.
But fear not, our crack web development team is already testing out a migration to phpbb 3.0.12, which will restore your live bookmarks Real Soon Now. Thanks for your patience.