--- a/parser/Makefile.in
+++ b/parser/Makefile.in
@@ -5,15 +5,14 @@
 DEPTH           = @DEPTH@
 topsrcdir       = @top_srcdir@
 srcdir          = @srcdir@
 VPATH           = @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= parser
-DIRS            = expat xml htmlparser html
 
 EXPORTS = \
   nsCharsetSource.h \
   $(NULL)
 
 include $(topsrcdir)/config/rules.mk

--- a/parser/expat/Makefile.in
+++ b/parser/expat/Makefile.in
@@ -5,13 +5,11 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= expat
-DIRS		= lib
-
 EXPORTS		= expat_config.h
 
 include $(topsrcdir)/config/rules.mk

new file mode 100644
--- /dev/null
+++ b/parser/expat/lib/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/parser/expat/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['lib']

new file mode 100644
--- /dev/null
+++ b/parser/html/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/parser/htmlparser/Makefile.in
+++ b/parser/htmlparser/Makefile.in
@@ -6,15 +6,10 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= htmlparser
-DIRS		= public src
-
-ifdef ENABLE_TESTS
-TOOL_DIRS	+= tests
-endif
 
 include $(topsrcdir)/config/rules.mk

new file mode 100644
--- /dev/null
+++ b/parser/htmlparser/moz.build
@@ -0,0 +1,7 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['public', 'src']
+TEST_TOOL_DIRS += ['tests']

new file mode 100644
--- /dev/null
+++ b/parser/htmlparser/public/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/parser/htmlparser/src/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/parser/htmlparser/tests/Makefile.in
+++ b/parser/htmlparser/tests/Makefile.in
@@ -4,14 +4,9 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
-
-DIRS = \
-	mochitest \
-	$(NULL)
-
 include $(topsrcdir)/config/rules.mk

--- a/parser/htmlparser/tests/mochitest/Makefile.in
+++ b/parser/htmlparser/tests/mochitest/Makefile.in
@@ -6,22 +6,16 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 relativesrcdir  = @relativesrcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS = \
-		dir_bug534293 \
-		html5lib_tree_construction \
-		$(NULL)
-
-
 MOCHITEST_FILES =	parser_datreader.js \
 		parser_web_testrunner.js \
 		html5_tree_construction_exceptions.js \
 		test_html5_tree_construction.html \
 		test_html5_tree_construction_part2.html \
 		test_bug102699.html \
 		file_bug102699.sjs \
 		test_bug174351.html \

new file mode 100644
--- /dev/null
+++ b/parser/htmlparser/tests/mochitest/dir_bug534293/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

--- a/parser/htmlparser/tests/mochitest/html5lib_tree_construction/Makefile.in
+++ b/parser/htmlparser/tests/mochitest/html5lib_tree_construction/Makefile.in
@@ -6,21 +6,16 @@
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 relativesrcdir  = @relativesrcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-DIRS = \
-		scripted \
-		$(NULL)
-
-
 MOCHITEST_FILES =	adoption01.dat \
 		adoption02.dat \
 		comments01.dat \
 		doctype01.dat \
 		entities01.dat \
 		entities02.dat \
 		html5test-com.dat \
 		inbody01.dat \

new file mode 100644
--- /dev/null
+++ b/parser/htmlparser/tests/mochitest/html5lib_tree_construction/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+TEST_DIRS += ['scripted']

new file mode 100644
--- /dev/null
+++ b/parser/htmlparser/tests/mochitest/html5lib_tree_construction/scripted/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/parser/htmlparser/tests/mochitest/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+TEST_DIRS += ['dir_bug534293', 'html5lib_tree_construction']

new file mode 100644
--- /dev/null
+++ b/parser/htmlparser/tests/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+TEST_DIRS += ['mochitest']

new file mode 100644
--- /dev/null
+++ b/parser/moz.build
@@ -0,0 +1,6 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['expat', 'xml', 'htmlparser', 'html']

--- a/parser/xml/Makefile.in
+++ b/parser/xml/Makefile.in
@@ -3,14 +3,9 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 DEPTH           = @DEPTH@
 topsrcdir       = @top_srcdir@
 srcdir          = @srcdir@
 VPATH           = @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
-
-DIRS            = public src
-
-TEST_DIRS += test
-
 include $(topsrcdir)/config/rules.mk

new file mode 100644
--- /dev/null
+++ b/parser/xml/moz.build
@@ -0,0 +1,7 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DIRS += ['public', 'src']
+TEST_DIRS += ['test']

new file mode 100644
--- /dev/null
+++ b/parser/xml/public/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/parser/xml/src/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

new file mode 100644
--- /dev/null
+++ b/parser/xml/test/moz.build
@@ -0,0 +1,5 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+