Firefox crash when using dev bits with env var FORCED_DEPLOY_ROOT

Currently, when using dev bits with env var FORCED_DEPLOY_ROOT, loading applet in Firefox on windows will crash.

This is because Firefox will load a copy of npjp2 in browser; and then later our browser jvm will try to load another copy, this time from location set by FORCED_DEPLOY_ROOT. This caused undefined behavior with FF native code, and browser will crash.