Everythying else seems to work just fine, except that when you go to "My Profile" in Fireboard, it takes you to com_comprofiler&task=userDetails, rather than com_comprofiler. The reason that I would want the latter is that it would display all the Tabs, including "Forum" tab, which of course contains all the subscriptions and favourites. com_comprofiler&task=userDetails isn't very useful at all in the forum.

Does anyone have an idea how to modify the My Profile link within Fireboard to equate "User Profiles" in CB?

Go to components/com_fireboard/template/default_mod/plugin/profilebox/

Open profilebox.php

Search for "details" (there's only one entry!)

You will see a word 'userDetails', change it to 'userProfile'

Done! I just solved this, and it also gave me headaches. Hope it works for you!