FYI, i get this error too, latest version of Firefox. Looks like you fixed it, but i still get the error messages as Tahnan posted. I have noscript and ublock running but i tried disabling both and no joy. Right clicking the frame and choosing "show this frame only" or "Frame in new window/tab" does work. Thanks.
p.s. Didn't get word puzzle 1. Binned it off :)