Comment 8 for bug 1000885

The location of the crash suggests that there might be memory corruption, which is going to be fun to debug. The best way to start doing that is to build Firefox with --enable-valgrind --disable-jemalloc, so that you can run it with memcheck. The fact that this issue only occurs when using the Oracle plugin in an area of code completely unrelated to plugins (which works fine when the plugin isn't loaded) would suggest that it is quite likely to be a bug introduced by the Java plugin.