Does Firestorm have the option of selecting which grid to visit [Grid Manager]? There are many grids other than SL [Second Life]. These grids are all accessible via viewers/browsers like Firestorm but some viewers make it much easier than others.
I made a request earlier for the Kokua Viewer to be ported to FreeBSD. It allows you to select from a number of grids at login. It is not exclusively SL grid.
Kokua does have source code for Linux 32 & 64 bit.
I would be supportive of any effort to get a viewer working on Free/PC BSD as long as the viewer is flexible (related to managing grids).