Fire is a Blender addon that exports the current scene to the JanusVR FireBoxHTML-format. It generates the XML description of the room automatically, exports the objects and materials and launches into JanusVR with just one click. It can also import scenes directly from your PC or websites, just give it a URL.
It optionally also supports instant publication over the IPFS network (no server needed!).
More detailed installation instructions can be found here: https://firevr.readthedocs.io/en/latest/installation.html
This addon was tested under Ubuntu/Linux and Windows. Your feedback is welcome!