Me.dium, a new browser plug-in that enables XMPP-based social browsing and
messaging with other users of the World Wide Web, has opened up its private beta
to members of the Jabber community.
Read more at http://me.dium.com/jabber/.
It's a (yet) Firefox extension which shows your virtual neighbors in a sidebar.
Protocol seems to be XMPP over HTTPS (@me.dium: correct?). Looks quite
professional, smooth animations, additional features, cross web-site chat, no
integration with Jabber roster (but hey, you'll want that because they mention
Jabber. If they had a proprietary protocol, then you would not even think about
roster integration). Well done.
My #6 in the list of firefox-extensions-for-chat-on-web-pages. But surely one
of the best in this category.