If you are having an IM conversation using the chat bar, and then click on the name of the other party to access his/her profile, the following message pops:
Firefox doesn't know how to open this address, because the protocol (javasript) isn't associated with any program.
The actual Dolphin screen goes blank, and the URL shows http://demozzz.com/dolphin7b/MichelSwiss (which is the correct URL to the user's profile).
Hit refresh, and the profile shows fine.
*Tested on the BoonEx Beta 8 online demo, using FireFox 3.5.4.