Mozilla and, by extension, Firefox have laid out the direction they want to go - and have consistently moved in that direction. There is no redemption arc there, they are not going to turn the ship around - and every week and month that goes by, Firefox gains more slop and drifts further from the visions that founded it.
Projects like Tor Browser and Waterfox are painstakingly disabling / patching out the worst - but every release becomes more expensive, and things do slip through.