A few people asked me what my opinion is of the various Firefox forks that are becoming more popular after Mozilla screwed up. Rather than write my own explanation, I just found someone else’s blog post from last week that says pretty much the same thing, so I’m just going to point to that instead. I don’t normally read How-To Geek, but this explanation from Chris Hoffman is quite good. TL;DR: Firefox 52 ESR is the better recommendation.
Note that Flagfox does generally run in forks and I am occasionally releasing 5.2.x updates, regardless of if I recommend people use forks or not.