Mine's 57.0.2, but Firefox did a short upload yesterday for no apparent reason, and the troubleshooter says my Firefox crashed three times in the last 24 hours. That's news to me.
I still have a number of things I can try. I disabled Blur yesterday because it was slowing down my work on the database. The Blur script was delaying the loading of pages. It could also be an Ad Block peculiarity. It inexplicably blocks one picture of me on one of my son's web pages. The picture was part of a photo shoot years ago for a face cream ad, but it wasn't even the final photo chosen for the ad and there's no advertising anywhere on the photo. How does it know?