The small device has an open bootloader and it is not clear who is actually dehind the project, as Mozilla does has not provided any information so far.
"Firefox OS is an open platform freely available for any company to build on top of without restriction. This means companies can experiment with different form factors that run Firefox OS," Mozilla says.
Firefox developers have experimented with casting content to Roku streaming boxes, and recent developer notes hinted at the possibility that Firefox may also one day support Chromecast as well as an ominous "Netcast" device.
It looks like this Netcast device is this Firefox OS-powered streaming dongle.