Firefox OS isn't exactly the hottest smartphone platform around, but Mozilla is definitely committed to making it a thing of the future. With that in mind, perhaps we shouldn't be surprised to hear that, apparently, HTC developers are working to port Firefox OS to some (unnamed) HTC devices. According to @upleaks, it's not clear if this is done just for testing purposes, or if it's "a step to production."
Last year, HTC started making cheap MediaTek-based Android handsets, in an effort do diversify its line-up. So the company could certainly also try and see how things go with some Firefox smartphones (or at least one).
Right now, there aren't too many manufacturers who are making Firefox OS smartphones, though LG, ZTE, Huawei and Alcatel / TCL are notable among them. Most Firefox handsets are low-end, cheap devices targeted at first time smartphone users in emerging markets. The only Firefox smartphone that's truly notable is the LG-made Fx0, which is available only in Japan.
Should HTC invest time and resources in Firefox OS? Feel free to share your thoughts in the comments!