JDK-7105285 : BrowserJavaVersion key is not created for 64 bit JRE
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There is no HKLM\Software\JavaSoft\Java Runtime Environment\BrowserJavaVersion after 64 bit JRE install. isPlugin2() uses this key(see 7082676).
fixed in latest deploy nightly
This should be fixed after installer call using RegisterDeploy() to create registry keys.
BrowserJavaVersion only get created when there's FF installed on system by checking HKLM/SOFTWARE/Mozilla/Mozilla Firefox/CurrentVersion . Because there's no 64 bit Firefox, so 64 bit JRE never create this key.