Is it good to include the file from other app?

We could use https://github.com/mozilla-b2g/marionette-file-manager here.
I already fix the issue in https://bugzilla.mozilla.org/show_bug.cgi?id=943504#c8.

If we need land the patch as soon as possible, we could file a follow up bug for using the marionette-file-manager.
How you guys think?