I think it's about none of Firefox forks being remotely capable of evolving on their own. So any large scale push to leave Firefox for any of these forks might only hurt Firefox which would in turn hurt its forks.
My insignificant opinion on the matter is that it's great to have different flavors of Firefox that might be better suited for you, but it doesn't appear to lead to a solution to the underlying issue.
Breaks almost every site on the settings I've given it, by my design -- at least, until I grant the site some permissions. You don't get to run code on my browser unless I SAY you can!