During common “XUL extensions/application” development workflow, we need to reload
XULRunner chrome environment and enable/disable common debugging preferences.

The “Extension Developer Extension” Firefox Addon can do this kind of stuff
but is bigger than our needs.

So, at work, we have extracted this two common functionalities in two
MozREPL custom commands

To enable these new custom commands set “extensions.mozrepl.initUrl”
to the correct “file:///” url in your profile preferences.

Happy Hacking,
rpl