I do not know how many of us are using the HA-Bridge with the Mozilla Gateway (MG), but it certainly does allow much added capability. It integrates very nicely with MG in both directions. It is especially useful for creating custom scripts, adding it to the HA-Bridge with a device name. Then, going back to MG, scan for new devices and your script will show up as a new device. Just add it, and you now have a very easy way to run custom scrips. I am running HA-Bridge on a separate computer, which is never turned off. It also allows me to control what few X10 devices I have left as well, with the MG.
Also, as it is a full two way communication with MG<>HA-Bridge, it allows full Alexa control of all your MG devices. I have been using HA-Bridge for a few years now, and once I discovered the total integration with MG, I highly recommend it for all MG users. HA-Bridge will run on nearly all devices.