On my PW2 with FW 5.7.4, I just tried the JB in the first post. It display a web page with a bunch of smileys, and then after about a 7 second delay (just as with FW 5.6.5) it gave a popup saying "application error" just as before.
It seems that there could still be a vulnerability in there, if it could be expoited...
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