Can you share a Firefox crash ID from your about:crashes page? I see some bad flickering when I scroll with Firefox 59.0.3 on Windows 10, but I haven't been able to reproduce a crash yet.
This crash was caused by an internet security program called Palo Alto Networks' Cytool Traps that injects its DLL into Firefox's process and attempts to intercept and analyze network traffic. Here's the Firefox bug report:
