Currently marionette expects to either get the path to an existing profile (then it calls Profile.clone()) or no profile information at all, in which it lets mozprofile just create a fresh profile. http://dxr.mozilla.org/mozilla-central/source/testing/marionette/client/marionette/geckoinstance.py#66 Unfortunately mozprofile always creates the new profile in the Python temp directory: http://dxr.mozilla.org/mozilla-central/source/testing/mozbase/mozprofile/mozprofile/profile.py#67 So if I want to point marionette to a given directory for creating a fresh profile in there (instead of the systems Python default temp dir) I can't do that right now.

This patch checks if the given directory from the --profile argument is empty or not and either clones it or creates a new profile if the directory is empty.

Fixed restarts.