check out palemoon.org
Chances are good, that on a system were Firefox fails, that Pale Moon fails, too. I dislike to recommend a replacement browser for another browser, however...
I'm a long-time Firefox user that upgrades packages most days and haven't had any problems with the upgrade from 61.0.2-1 to 62.0-1 on 2018-09-06. I suspect there are many like me so Hubert should probably persevere with trying to give Mozilla enough detail for a diagnosis.