FULL PRODUCT VERSION :
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) Client VM (build 25.60-b23, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.10240]

A DESCRIPTION OF THE PROBLEM :
Firefox developer provide details about how this happen in https://bugzilla.mozilla.org/show_bug.cgi?id=1205979#c1

note that this happens after mozilla move Java to be out-of-process in https://bugzilla.mozilla.org/show_bug.cgi?id=874167
https://hg.mozilla.org/mozilla-central/rev/103d2a9af2ff





STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Run java plugin in Firefox.
2. Closed tab that run java.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
no crashes
ACTUAL -
crashes

REPRODUCIBILITY :
This bug can be reproduced always.