Hi,It seems nsDisplayList::DeleteAll is known upstream. ( https://bugzilla.mozilla.org/show_bug.cgi?id=619621 , https://bugzilla.mozilla.org/show_bug.cgi?id=1198710 )
Also, there is a workaround suggested in these bugs, to set layers.offmainthreadcomposition.enabled=falseWhich so far has led to no crashes so far (2 days, but previously was crashing about every 20 mins 50/50 between nsDisplayList::DeleteAll and morkNode::SlotStrongNode ).
This is on version 1:45.2.0-4. Regards, Andrew