Ah - this error occurs, because the JSON string is malformed. Most likely because the JSON string includes UTF-8, but the transport is not UTF-8 safe, as the warning message upon initialization says.
As I said, I can't test it because Firefox 8 is in beta and not available as a portable installation. My recommendation is to avoid pages that need encoding outside the 7-bit ASCII characters.
You could tell me what version of MozRepl::RemoteObject and WWW::Mechanize::Firefox and what version of the mozrepl plugin for Firefox you use. There are branches of mozrepl with UTF-8 safe transport, and I wonder why installing my own UTF-8-safe transport fails. But, again, I don't have your version of Firefox and thus can't test it.
In reply to Re^3: RemoteObject.pm fails in open firefox8.0
by Corion
in thread RemoteObject.pm fails in open firefox8.0
by seven_shen
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