--- a/config/rules.mk
+++ b/config/rules.mk
@@ -1227,27 +1227,19 @@ endif
 
 ifneq ($(PREF_JS_EXPORTS),)
 # on win32, pref files need CRLF line endings... see bug 206029
 ifeq (WINNT,$(OS_ARCH))
 PREF_PPFLAGS = --line-endings=crlf
 endif
 
 ifndef NO_DIST_INSTALL
-$(FINAL_TARGET)/$(PREF_DIR):
-	$(NSINSTALL) -D $@
-
-libs:: $(FINAL_TARGET)/$(PREF_DIR)
-libs:: $(PREF_JS_EXPORTS)
-	$(EXIT_ON_ERROR)  \
-	for i in $^; do \
-	  dest=$(FINAL_TARGET)/$(PREF_DIR)/`basename $$i`; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(topsrcdir)/config/Preprocessor.py $(PREF_PPFLAGS) $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) $$i > $$dest; \
-	done
+PREF_JS_EXPORTS_PATH := $(FINAL_TARGET)/$(PREF_DIR)
+PREF_JS_EXPORTS_FLAGS := $(PREF_PPFLAGS)
+PP_TARGETS += PREF_JS_EXPORTS
 endif
 endif
 
 ################################################################################
 # Copy each element of AUTOCFG_JS_EXPORTS to $(FINAL_TARGET)/defaults/autoconfig
 
 ifneq ($(AUTOCFG_JS_EXPORTS),)
 $(FINAL_TARGET)/defaults/autoconfig::
@@ -1317,16 +1309,17 @@ ifneq ($(XPIDL_MODULE).idl,$(strip $(XPI
 $(XPIDL_GEN_DIR)/$(XPIDL_MODULE).xpt: $(patsubst %.idl,$(XPIDL_GEN_DIR)/%.xpt,$(XPIDLSRCS)) $(GLOBAL_DEPS)
 	$(XPIDL_LINK) $(XPIDL_GEN_DIR)/$(XPIDL_MODULE).xpt $(patsubst %.idl,$(XPIDL_GEN_DIR)/%.xpt,$(XPIDLSRCS))
 endif # XPIDL_MODULE.xpt != XPIDLSRCS
 
 libs:: $(XPIDL_GEN_DIR)/$(XPIDL_MODULE).xpt
 ifndef NO_DIST_INSTALL
 	$(call install_cmd,$(IFLAGS1) $(XPIDL_GEN_DIR)/$(XPIDL_MODULE).xpt $(FINAL_TARGET)/components)
 ifndef NO_INTERFACES_MANIFEST
+libs:: $(call mkdir_deps,$(FINAL_TARGET)/components)
 	@$(PYTHON) $(MOZILLA_DIR)/config/buildlist.py $(FINAL_TARGET)/components/interfaces.manifest "interfaces $(XPIDL_MODULE).xpt"
 	@$(PYTHON) $(MOZILLA_DIR)/config/buildlist.py $(FINAL_TARGET)/chrome.manifest "manifest components/interfaces.manifest"
 endif
 endif
 
 GARBAGE_DIRS		+= $(XPIDL_GEN_DIR)
 
 endif #} XPIDLSRCS
@@ -1367,32 +1360,25 @@ ifdef EXTRA_COMPONENTS
 libs:: $(EXTRA_COMPONENTS)
 ifndef NO_DIST_INSTALL
 	$(call install_cmd,$(IFLAGS1) $^ $(FINAL_TARGET)/components)
 endif
 
 endif
 
 ifdef EXTRA_PP_COMPONENTS
-libs:: $(EXTRA_PP_COMPONENTS)
 ifndef NO_DIST_INSTALL
-	$(EXIT_ON_ERROR) \
-	$(NSINSTALL) -D $(FINAL_TARGET)/components; \
-	for i in $^; do \
-	  fname=`basename $$i`; \
-	  dest=$(FINAL_TARGET)/components/$${fname}; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(topsrcdir)/config/Preprocessor.py $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) $$i > $$dest; \
-	done
+EXTRA_PP_COMPONENTS_PATH := $(FINAL_TARGET)/components
+PP_TARGETS += EXTRA_PP_COMPONENTS
 endif
 endif
 
 EXTRA_MANIFESTS = $(filter %.manifest,$(EXTRA_COMPONENTS) $(EXTRA_PP_COMPONENTS))
 ifneq (,$(EXTRA_MANIFESTS))
-libs::
+libs:: $(call mkdir_deps,$(FINAL_TARGET))
 	$(PYTHON) $(MOZILLA_DIR)/config/buildlist.py $(FINAL_TARGET)/chrome.manifest $(patsubst %,"manifest components/%",$(notdir $(EXTRA_MANIFESTS)))
 endif
 
 ################################################################################
 # Copy each element of EXTRA_JS_MODULES to JS_MODULES_PATH, or
 # $(FINAL_TARGET)/modules if that isn't defined.
 JS_MODULES_PATH ?= $(FINAL_TARGET)/modules
 
@@ -1400,27 +1386,20 @@ ifdef EXTRA_JS_MODULES
 libs:: $(EXTRA_JS_MODULES)
 ifndef NO_DIST_INSTALL
 	$(call install_cmd,$(IFLAGS1) $^ $(JS_MODULES_PATH))
 endif
 
 endif
 
 ifdef EXTRA_PP_JS_MODULES
-libs:: $(EXTRA_PP_JS_MODULES)
 ifndef NO_DIST_INSTALL
-	$(EXIT_ON_ERROR) \
-	$(NSINSTALL) -D $(JS_MODULES_PATH); \
-	for i in $^; do \
-	  dest=$(JS_MODULES_PATH)/`basename $$i`; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(topsrcdir)/config/Preprocessor.py $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) $$i > $$dest; \
-	done
+EXTRA_PP_JS_MODULES_PATH := $(JS_MODULES_PATH)
+PP_TARGETS += EXTRA_PP_JS_MODULES
 endif
-
 endif
 
 ################################################################################
 # Copy testing-only JS modules to appropriate destination.
 #
 # For each file defined in TESTING_JS_MODULES, copy it to
 # objdir/_tests/modules/. If TESTING_JS_MODULE_DIR is defined, that path
 # wlll be appended to the output directory.
@@ -1481,41 +1460,25 @@ libs realchrome:: $(CHROME_DEPS) $(FINAL
 	$(PYTHON) $(MOZILLA_DIR)/config/JarMaker.py \
 	  $(QUIET) -j $(FINAL_TARGET)/chrome \
 	  $(MAKE_JARS_FLAGS) $(XULPPFLAGS) $(DEFINES) $(ACDEFINES) \
 	  $(JAR_MANIFEST)
 endif
 endif
 
 ifneq ($(DIST_FILES),)
-$(DIST)/bin:
-	$(NSINSTALL) -D $@
-
-libs:: $(DIST)/bin
-libs:: $(DIST_FILES)
-	@$(EXIT_ON_ERROR) \
-	for f in $^; do \
-	  dest=$(FINAL_TARGET)/`basename $$f`; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(MOZILLA_DIR)/config/Preprocessor.py \
-	    $(XULAPP_DEFINES) $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) \
-	    $$f > $$dest; \
-	done
+DIST_FILES_PATH := $(FINAL_TARGET)
+DIST_FILES_FLAGS := $(XULAPP_DEFINES)
+PP_TARGETS += DIST_FILES
 endif
 
 ifneq ($(DIST_CHROME_FILES),)
-libs:: $(DIST_CHROME_FILES)
-	@$(EXIT_ON_ERROR) \
-	for f in $^; do \
-	  dest=$(FINAL_TARGET)/chrome/`basename $$f`; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(MOZILLA_DIR)/config/Preprocessor.py \
-	    $(XULAPP_DEFINES) $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) \
-	    $$f > $$dest; \
-	done
+DIST_CHROME_FILES_PATH := $(FINAL_TARGET)/chrome
+DIST_CHROME_FILES_FLAGS := $(XULAPP_DEFINES)
+PP_TARGETS += DIST_CHROME_FILES
 endif
 
 ifneq ($(XPI_PKGNAME),)
 libs realchrome::
 ifdef STRIP_XPI
 ifndef MOZ_DEBUG
 	@echo "Stripping $(XPI_PKGNAME) package directory..."
 	@echo $(FINAL_TARGET)
@@ -1664,16 +1627,42 @@ ifdef ETAGS
 ifneq ($(CSRCS)$(CPPSRCS)$(HEADERS),)
 all:: TAGS
 TAGS:: $(CSRCS) $(CPPSRCS) $(HEADERS)
 	$(ETAGS) $(CSRCS) $(CPPSRCS) $(HEADERS)
 endif
 endif
 
 ################################################################################
+# Preprocessing rules
+#
+# The PP_TARGETS variable contains a list of all preprocessing target
+# categories. Each category defines a target path, and optional extra flags
+# like the following:
+#
+# FOO_PATH := target_path
+# FOO_FLAGS := -Dsome_flag
+# PP_TARGETS += FOO
+
+# preprocess_file_template defines preprocessing rules.
+# $(call preprocess_file_template, source_file, target_path, extra_flags)
+define preprocess_file_template
+$(2)/$(notdir $(1)): $(1) $$(call mkdir_deps,$(2)) $$(GLOBAL_DEPS)
+	$$(RM) $$@
+	$$(PYTHON) $$(topsrcdir)/config/Preprocessor.py $(3) $$(DEFINES) $$(ACDEFINES) $$(XULPPFLAGS) $$< > $$@
+libs:: $(2)/$(notdir $(1))
+endef
+
+$(foreach category,$(PP_TARGETS),\
+  $(foreach file,$($(category)),\
+    $(eval $(call preprocess_file_template,$(file),$($(category)_PATH),$($(category)_FLAGS)))\
+   )\
+ )
+
+################################################################################
 # Special gmake rules.
 ################################################################################
 
 
 #
 # Disallow parallel builds with MSVC < 8
 #
 ifneq (,$(filter 1200 1300 1310,$(_MSC_VER)))

--- a/js/src/config/rules.mk
+++ b/js/src/config/rules.mk
@@ -1227,27 +1227,19 @@ endif
 
 ifneq ($(PREF_JS_EXPORTS),)
 # on win32, pref files need CRLF line endings... see bug 206029
 ifeq (WINNT,$(OS_ARCH))
 PREF_PPFLAGS = --line-endings=crlf
 endif
 
 ifndef NO_DIST_INSTALL
-$(FINAL_TARGET)/$(PREF_DIR):
-	$(NSINSTALL) -D $@
-
-libs:: $(FINAL_TARGET)/$(PREF_DIR)
-libs:: $(PREF_JS_EXPORTS)
-	$(EXIT_ON_ERROR)  \
-	for i in $^; do \
-	  dest=$(FINAL_TARGET)/$(PREF_DIR)/`basename $$i`; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(topsrcdir)/config/Preprocessor.py $(PREF_PPFLAGS) $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) $$i > $$dest; \
-	done
+PREF_JS_EXPORTS_PATH := $(FINAL_TARGET)/$(PREF_DIR)
+PREF_JS_EXPORTS_FLAGS := $(PREF_PPFLAGS)
+PP_TARGETS += PREF_JS_EXPORTS
 endif
 endif
 
 ################################################################################
 # Copy each element of AUTOCFG_JS_EXPORTS to $(FINAL_TARGET)/defaults/autoconfig
 
 ifneq ($(AUTOCFG_JS_EXPORTS),)
 $(FINAL_TARGET)/defaults/autoconfig::
@@ -1317,16 +1309,17 @@ ifneq ($(XPIDL_MODULE).idl,$(strip $(XPI
 $(XPIDL_GEN_DIR)/$(XPIDL_MODULE).xpt: $(patsubst %.idl,$(XPIDL_GEN_DIR)/%.xpt,$(XPIDLSRCS)) $(GLOBAL_DEPS)
 	$(XPIDL_LINK) $(XPIDL_GEN_DIR)/$(XPIDL_MODULE).xpt $(patsubst %.idl,$(XPIDL_GEN_DIR)/%.xpt,$(XPIDLSRCS))
 endif # XPIDL_MODULE.xpt != XPIDLSRCS
 
 libs:: $(XPIDL_GEN_DIR)/$(XPIDL_MODULE).xpt
 ifndef NO_DIST_INSTALL
 	$(call install_cmd,$(IFLAGS1) $(XPIDL_GEN_DIR)/$(XPIDL_MODULE).xpt $(FINAL_TARGET)/components)
 ifndef NO_INTERFACES_MANIFEST
+libs:: $(call mkdir_deps,$(FINAL_TARGET)/components)
 	@$(PYTHON) $(MOZILLA_DIR)/config/buildlist.py $(FINAL_TARGET)/components/interfaces.manifest "interfaces $(XPIDL_MODULE).xpt"
 	@$(PYTHON) $(MOZILLA_DIR)/config/buildlist.py $(FINAL_TARGET)/chrome.manifest "manifest components/interfaces.manifest"
 endif
 endif
 
 GARBAGE_DIRS		+= $(XPIDL_GEN_DIR)
 
 endif #} XPIDLSRCS
@@ -1367,32 +1360,25 @@ ifdef EXTRA_COMPONENTS
 libs:: $(EXTRA_COMPONENTS)
 ifndef NO_DIST_INSTALL
 	$(call install_cmd,$(IFLAGS1) $^ $(FINAL_TARGET)/components)
 endif
 
 endif
 
 ifdef EXTRA_PP_COMPONENTS
-libs:: $(EXTRA_PP_COMPONENTS)
 ifndef NO_DIST_INSTALL
-	$(EXIT_ON_ERROR) \
-	$(NSINSTALL) -D $(FINAL_TARGET)/components; \
-	for i in $^; do \
-	  fname=`basename $$i`; \
-	  dest=$(FINAL_TARGET)/components/$${fname}; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(topsrcdir)/config/Preprocessor.py $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) $$i > $$dest; \
-	done
+EXTRA_PP_COMPONENTS_PATH := $(FINAL_TARGET)/components
+PP_TARGETS += EXTRA_PP_COMPONENTS
 endif
 endif
 
 EXTRA_MANIFESTS = $(filter %.manifest,$(EXTRA_COMPONENTS) $(EXTRA_PP_COMPONENTS))
 ifneq (,$(EXTRA_MANIFESTS))
-libs::
+libs:: $(call mkdir_deps,$(FINAL_TARGET))
 	$(PYTHON) $(MOZILLA_DIR)/config/buildlist.py $(FINAL_TARGET)/chrome.manifest $(patsubst %,"manifest components/%",$(notdir $(EXTRA_MANIFESTS)))
 endif
 
 ################################################################################
 # Copy each element of EXTRA_JS_MODULES to JS_MODULES_PATH, or
 # $(FINAL_TARGET)/modules if that isn't defined.
 JS_MODULES_PATH ?= $(FINAL_TARGET)/modules
 
@@ -1400,27 +1386,20 @@ ifdef EXTRA_JS_MODULES
 libs:: $(EXTRA_JS_MODULES)
 ifndef NO_DIST_INSTALL
 	$(call install_cmd,$(IFLAGS1) $^ $(JS_MODULES_PATH))
 endif
 
 endif
 
 ifdef EXTRA_PP_JS_MODULES
-libs:: $(EXTRA_PP_JS_MODULES)
 ifndef NO_DIST_INSTALL
-	$(EXIT_ON_ERROR) \
-	$(NSINSTALL) -D $(JS_MODULES_PATH); \
-	for i in $^; do \
-	  dest=$(JS_MODULES_PATH)/`basename $$i`; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(topsrcdir)/config/Preprocessor.py $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) $$i > $$dest; \
-	done
+EXTRA_PP_JS_MODULES_PATH := $(JS_MODULES_PATH)
+PP_TARGETS += EXTRA_PP_JS_MODULES
 endif
-
 endif
 
 ################################################################################
 # Copy testing-only JS modules to appropriate destination.
 #
 # For each file defined in TESTING_JS_MODULES, copy it to
 # objdir/_tests/modules/. If TESTING_JS_MODULE_DIR is defined, that path
 # wlll be appended to the output directory.
@@ -1481,41 +1460,25 @@ libs realchrome:: $(CHROME_DEPS) $(FINAL
 	$(PYTHON) $(MOZILLA_DIR)/config/JarMaker.py \
 	  $(QUIET) -j $(FINAL_TARGET)/chrome \
 	  $(MAKE_JARS_FLAGS) $(XULPPFLAGS) $(DEFINES) $(ACDEFINES) \
 	  $(JAR_MANIFEST)
 endif
 endif
 
 ifneq ($(DIST_FILES),)
-$(DIST)/bin:
-	$(NSINSTALL) -D $@
-
-libs:: $(DIST)/bin
-libs:: $(DIST_FILES)
-	@$(EXIT_ON_ERROR) \
-	for f in $^; do \
-	  dest=$(FINAL_TARGET)/`basename $$f`; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(MOZILLA_DIR)/config/Preprocessor.py \
-	    $(XULAPP_DEFINES) $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) \
-	    $$f > $$dest; \
-	done
+DIST_FILES_PATH := $(FINAL_TARGET)
+DIST_FILES_FLAGS := $(XULAPP_DEFINES)
+PP_TARGETS += DIST_FILES
 endif
 
 ifneq ($(DIST_CHROME_FILES),)
-libs:: $(DIST_CHROME_FILES)
-	@$(EXIT_ON_ERROR) \
-	for f in $^; do \
-	  dest=$(FINAL_TARGET)/chrome/`basename $$f`; \
-	  $(RM) -f $$dest; \
-	  $(PYTHON) $(MOZILLA_DIR)/config/Preprocessor.py \
-	    $(XULAPP_DEFINES) $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) \
-	    $$f > $$dest; \
-	done
+DIST_CHROME_FILES_PATH := $(FINAL_TARGET)/chrome
+DIST_CHROME_FILES_FLAGS := $(XULAPP_DEFINES)
+PP_TARGETS += DIST_CHROME_FILES
 endif
 
 ifneq ($(XPI_PKGNAME),)
 libs realchrome::
 ifdef STRIP_XPI
 ifndef MOZ_DEBUG
 	@echo "Stripping $(XPI_PKGNAME) package directory..."
 	@echo $(FINAL_TARGET)
@@ -1664,16 +1627,42 @@ ifdef ETAGS
 ifneq ($(CSRCS)$(CPPSRCS)$(HEADERS),)
 all:: TAGS
 TAGS:: $(CSRCS) $(CPPSRCS) $(HEADERS)
 	$(ETAGS) $(CSRCS) $(CPPSRCS) $(HEADERS)
 endif
 endif
 
 ################################################################################
+# Preprocessing rules
+#
+# The PP_TARGETS variable contains a list of all preprocessing target
+# categories. Each category defines a target path, and optional extra flags
+# like the following:
+#
+# FOO_PATH := target_path
+# FOO_FLAGS := -Dsome_flag
+# PP_TARGETS += FOO
+
+# preprocess_file_template defines preprocessing rules.
+# $(call preprocess_file_template, source_file, target_path, extra_flags)
+define preprocess_file_template
+$(2)/$(notdir $(1)): $(1) $$(call mkdir_deps,$(2)) $$(GLOBAL_DEPS)
+	$$(RM) $$@
+	$$(PYTHON) $$(topsrcdir)/config/Preprocessor.py $(3) $$(DEFINES) $$(ACDEFINES) $$(XULPPFLAGS) $$< > $$@
+libs:: $(2)/$(notdir $(1))
+endef
+
+$(foreach category,$(PP_TARGETS),\
+  $(foreach file,$($(category)),\
+    $(eval $(call preprocess_file_template,$(file),$($(category)_PATH),$($(category)_FLAGS)))\
+   )\
+ )
+
+################################################################################
 # Special gmake rules.
 ################################################################################
 
 
 #
 # Disallow parallel builds with MSVC < 8
 #
 ifneq (,$(filter 1200 1300 1310,$(_MSC_VER)))

--- a/testing/mochitest/specialpowers/Makefile.in
+++ b/testing/mochitest/specialpowers/Makefile.in
@@ -24,14 +24,18 @@ XPI_NAME=specialpowers
 
 # Used in install.rdf
 USE_EXTENSION_MANIFEST=1
 
 TEST_EXTENSIONS_DIR = $(DEPTH)/_tests/testing/mochitest/extensions
 
 include $(topsrcdir)/config/rules.mk
 
+# JarMaker creates a chrome.manifest already, so the one from the source
+# directory is not copied if it's not forced to be.
+$(FINAL_TARGET)/chrome.manifest: FORCE
+
 libs-preqs = \
   $(call mkdir_deps,$(TEST_EXTENSIONS_DIR)) \
   $(NULL)
 
 libs:: $(libs-preqs)
 	(cd $(DIST)/xpi-stage && tar $(TAR_CREATE_FLAGS) - $(XPI_NAME)) | (cd $(TEST_EXTENSIONS_DIR) && tar -xf -)

--- a/webapprt/Makefile.in
+++ b/webapprt/Makefile.in
@@ -55,17 +55,17 @@ include $(topsrcdir)/config/rules.mk
 ifdef MOZ_DEBUG
 DEFINES += -DMOZ_DEBUG=1
 endif
 
 ifdef MOZILLA_OFFICIAL
 DEFINES += -DMOZILLA_OFFICIAL
 endif
 
-libs::
+libs:: $(call mkdir_deps,$(FINAL_TARGET))
 	$(PYTHON) $(MOZILLA_DIR)/config/buildlist.py $(FINAL_TARGET)/chrome.manifest "resource webapprt ./"
 
 GRE_MILESTONE := $(shell tail -n 1 $(topsrcdir)/config/milestone.txt 2>/dev/null || tail -1 $(topsrcdir)/config/milestone.txt)
 GRE_BUILDID := $(shell cat $(DEPTH)/config/buildid)
 DEFINES += -DGRE_MILESTONE=$(GRE_MILESTONE) \
            -DGRE_BUILDID=$(GRE_BUILDID) \
            -DMOZ_APP_BASENAME=$(MOZ_APP_BASENAME) \
            $(NULL)