Backed out changeset b6beaa787043 (bug 1319705) for marionette mass bustage. r=backout on a CLOSED TREE

testing/config/marionette_requirements.txt

@@ -3,6 +3,3 @@
 ../marionette/client
 ../marionette/marionette/runner/mixins/browsermob-proxy-py
 ../marionette
-
-# Allows to use the Puppeteer page object model for Firefox
-../puppeteer/firefox/