Imagine: first thing you do upon rolling out of bed is pop in front of the camera and do a YouTube tut on Firefox! Cool!
Anyway, there are some things in there that were good reminders that one may not have remembered if you had to completely reinstall it for some reason--stuff like turning off telemetry and whatnot.
I sandbox Firefox and it's another layer and it doesn't impact performance (it used to, believe me). Plus it also deletes history just the way I like it on exit. Thanks for the reminders on hardening!