@garrytre Understood and agreed. My question though was based on the fact that when the RPI3 was first introduced FF had already been rolled and delivered as a default install with Ubuntu Mate for the platform. That means that some one went to some trouble working out the kinks. Now, it appears that RPI is a forgotten concern - just 1 of 9000.
When I got the RPI3 in April of 2016, just months after it was available, FF worked. Chrome on the other hand did not work and it took more then a year for "some one" to fix it. And, it works now..... sort of.
I did not pay much for the RPI3 and of course nothing for the OS or the browser. My experience with the RPI3 has led me to invest in a different direction. I don't have time for this crap though I do love the idea.