Today 10 years ago I went to Poland to buy a Phone with pre installed #Firefox OS on. The Phone was a Alcatel One, so very shitty. Two years later I installed Firefox OS on my Nexus 5 instead.
It was a very good concept, but sadly rolled out on too shitty hardware so it never caught on.
I never understood why they targetted low end hardware with a tech stack that's notoriously slow (web).
This was exactly my (dumb, layman) view of things - great idea hobbled from the outset by the marriage of slow web apps with slower hardware.
To keep it affordable?
Then use something more efficient than the web stack. In the end, Android ran better on the same devices and had better software support.