Note that version 0.49 is pretty old. Also note that mozrepl itself is a Mozilla/Firefox component and not supported here. You may want to consult the package manager of your operating system to install packages and their prerequisites. Also, you might want to take a look at http://cpansearch.perl.org/src/CORION/MozRepl-RemoteObject-0.29/Changes for further hints on how to install a recent version of the mozrepl plugin.