I remember that time & feeling the absolute need to run Minefield (for Fx v4.x) over stable since the next gen features/performance were too important even without add-on compatibility. The 4.0 release took forever in testing & Chrome flew out like a rocket. And even thru the lulls, Fx performance has always been good enough to stick around (tho eventually I moved to LibreWolf due to management of the new browser feature defaults).
