At least for me, both, MozRepl::RemoteObject and WWW::Mechanize::Firefox pass their test suite(s) on Firefox 7 beta 5. If you have contrary findings please report them here, but it seems to be something more special to your environment than a general incompatibility.

In reply to Re: MozRepl/Client.pm does not support firefox 7.0 by Corion
in thread MozRepl/Client.pm does not support firefox 7.0 by seven_shen

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