Thank you for the report ID and sorry to hear about the crashes. The signature RtlpFreeHeap | RtlpFreeHeapInternal | RtlFreeHeap | rtsultramonhook.dll includes a file from Realtime Soft's UltraMon program. That doesn't necessarily mean it is incompatible with Firefox 78.0.2, but that is one possibility. Your report also mentions Malwarebytes Anti-Exploit and Webroot running, so maybe there is some multiple-program interaction issue???