Do you have any crash report IDs in your Firefox's about:crashes page? I can check whether a Bugzilla bug report has already been filed for those crashes.
bp-cb27fd07-ad27-49bf-b6c2-9dbbb0211005
bp-96eef135-da51-45a8-a792-d28810211005
bp-184a8916-227c-42c4-8308-6e3c00211005
bp-ba6748d3-2d93-4d84-992e-8cf960211005
bp-8bdfb00f-0e30-4cd3-826c-efb910211005
Here is the Bugzilla ticket: https://bugzilla.mozilla.org/show_bug.cgi?id=1572915