So `jpm` now [sets specefic prefs](https://github.com/mozilla/jpm/search?q=pass+in&ref=cmdform&type=Issues) to communicate execution configuration. Also #mozilla/jpm#21 defines pref to communicate weather add-on should be
execute in `run` or `test` mode.

I think these are worth mentioning, I also think that in long term we need to move from prefs to a CLI option(s) in firefox so to make third party tools actually possible.