As we all know very well that Mozillas idea for Firefox was clear.
Creating an alternate operating system to Android and that would be used in low-end smartphones.
But this dream eventually falls to the ground and the Firefox OS was eventually abandoned.

Mozilla Stopped All The Commercial Development Of Firefox OS
Mozillas idea for Firefox was clear.
Creating an alternate operating system to Android and that would be used in low-end smartphones.
But this dream eventually falls to the ground and the Firefox OS was eventually abandoned.

Now, several months after being put aside, Mozilla announced the end of its operating system.
In the spring and summer of 2016 the Connected Devices team dug deeper into opportunities for Firefox OS.
Firefox OS 2.6 would be the last release from Mozilla..

The latest released version is 2.6 and is not expected to arise any new versions or updates.