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Use with XULRunner
Simply put MozRepl XPI package under your application’s
extensions/ directory (ensuring that the expanded xpi’s directory or the .xpi filename matches its
install.rdf) and launch the application like this:
$ xulrunner application.ini -repl
You can optionally specify a port number after the
-repl switch, otherwise the default 4242 will be used.
If you get tired of typing
-repl on the command line, you can also set the
extensions.mozrepl.autoStart preference to
Note: This technique also works for Thunderbird, and (probably) any other Mozilla-based product that supports extensions.