--- a/browser/moz.build	2017-11-02
+++ b/browser/moz.build	2017-11-21
@@ -11,12 +11,10 @@
 DIRS += [
     'base',
     'components',
-    'experiments',
     'fonts',
     'locales',
     'modules',
     'themes',
-    'extensions',
 ]
 
 DIRS += [
@@ -27,7 +25,6 @@
     DIRS += ['installer/windows']
 
 TEST_DIRS += [
-    'tools/mozscreenshots',
 ]
 
 DIST_SUBDIR = 'browser'
--- a/browser/app/Makefile.in
+++ b/browser/app/Makefile.in
@@ -107,4 +107,3 @@
 
 .PHONY: features
 tools features::
-	$(PYTHON) -c 'import os, json; listing = {"system": os.listdir("$(DIST)/bin/browser/features")}; print json.dumps(listing)' > $(DIST)/bin/browser/chrome/browser/content/browser/built_in_addons.json