--- a/configure.in
+++ b/configure.in
@@ -7839,17 +7839,25 @@ fi
 MOZ_PACKAGER_FORMAT="$MOZ_CHROME_FILE_FORMAT"
 if test "$OS_ARCH" = "WINNT" -o "$OS_ARCH" = "OS2" -o "$MOZ_WIDGET_TOOLKIT" = "android"; then
     MOZ_CHROME_FILE_FORMAT=flat
 else
     MOZ_CHROME_FILE_FORMAT=symlink
 fi
 
 if test "$MOZ_WIDGET_TOOLKIT" = "android"; then
-    dnl On Android, static resources live in the assets/ folder of the APK.
+    dnl Fennec's static resources live in the assets/ folder of the
+    dnl APK.  Adding a path to the name here works because we only
+    dnl have one omnijar file in the final package (which is not the
+    dnl case on desktop), and necessitates some contortions during
+    dnl packaging so that the resources in the omnijar are considered
+    dnl as rooted at / and not as rooted at assets/ (which again is
+    dnl not the case on desktop: there are omnijars rooted at webrtc/,
+    dnl etc). packager.mk handles changing the rooting of the single
+    dnl omnijar.
     OMNIJAR_NAME=assets/omni.ja
 else
     OMNIJAR_NAME=omni.ja
 fi
 
 AC_SUBST(OMNIJAR_NAME)
 AC_SUBST(MOZ_OMNIJAR)
 AC_SUBST(MOZ_PACKAGER_FORMAT)

--- a/toolkit/mozapps/installer/packager.mk
+++ b/toolkit/mozapps/installer/packager.mk
@@ -352,44 +352,67 @@ ASSET_SO_LIBRARIES := $(addprefix assets
 DIST_FILES := $(filter-out $(SO_LIBRARIES),$(DIST_FILES))
 NON_DIST_FILES += libmozglue.so $(MOZ_CHILD_PROCESS_NAME) $(ASSET_SO_LIBRARIES)
 
 ifdef MOZ_ENABLE_SZIP
 # These libraries are szipped in-place in the assets/ directory.
 SZIP_LIBRARIES := $(ASSET_SO_LIBRARIES)
 endif
 
+# Fennec's OMNIJAR_NAME can include a directory; for example, it might
+# be "assets/omni.ja". This path specifies where the omni.ja file
+# lives in the APK, but should not root the resources it contains
+# under assets/ (i.e., resources should not live at chrome://assets/).
+# packager.py writes /omni.ja in order to be consistent with the
+# layout expected by language repacks. Therefore, we move it to the
+# correct path here, in INNER_MAKE_PACKAGE. See comment about
+# OMNIJAR_NAME in configure.in.
+
+# OMNIJAR_DIR is './' for "omni.ja", 'assets/' for "assets/omni.ja".
+OMNIJAR_DIR := $(dir $(OMNIJAR_NAME))
+OMNIJAR_NAME := $(notdir $(OMNIJAR_NAME))
+
 PKG_SUFFIX      = .apk
 INNER_MAKE_PACKAGE	= \
   $(if $(ALREADY_SZIPPED),,$(foreach lib,$(SZIP_LIBRARIES),host/bin/szip $(MOZ_SZIP_FLAGS) $(STAGEPATH)$(MOZ_PKG_DIR)$(_BINPATH)/$(lib) && )) \
   make -C $(GECKO_APP_AP_PATH) gecko.ap_ && \
   cp $(GECKO_APP_AP_PATH)/gecko.ap_ $(_ABS_DIST) && \
   ( cd $(STAGEPATH)$(MOZ_PKG_DIR)$(_BINPATH) && \
     mkdir -p lib/$(ABI_DIR) && \
     mv libmozglue.so $(MOZ_CHILD_PROCESS_NAME) lib/$(ABI_DIR) && \
     unzip -o $(_ABS_DIST)/gecko.ap_ && \
     rm $(_ABS_DIST)/gecko.ap_ && \
     $(ZIP) -0 $(_ABS_DIST)/gecko.ap_ $(ASSET_SO_LIBRARIES) && \
     $(ZIP) -r9D $(_ABS_DIST)/gecko.ap_ $(DIST_FILES) -x $(NON_DIST_FILES) $(SZIP_LIBRARIES) && \
-    $(ZIP) -0 $(_ABS_DIST)/gecko.ap_ $(OMNIJAR_NAME)) && \
+    $(if $(filter-out ./,$(OMNIJAR_DIR)), \
+      mkdir -p $(OMNIJAR_DIR) && mv $(OMNIJAR_NAME) $(OMNIJAR_DIR) && ) \
+    $(ZIP) -0 $(_ABS_DIST)/gecko.ap_ $(OMNIJAR_DIR)$(OMNIJAR_NAME)) && \
   rm -f $(_ABS_DIST)/gecko.apk && \
   cp $(_ABS_DIST)/gecko.ap_ $(_ABS_DIST)/gecko.apk && \
   $(ZIP) -j0 $(_ABS_DIST)/gecko.apk $(STAGEPATH)$(MOZ_PKG_DIR)$(_BINPATH)/classes.dex && \
   cp $(_ABS_DIST)/gecko.apk $(_ABS_DIST)/gecko-unsigned-unaligned.apk && \
   $(RELEASE_JARSIGNER) $(_ABS_DIST)/gecko.apk && \
   $(ZIPALIGN) -f -v 4 $(_ABS_DIST)/gecko.apk $(PACKAGE) && \
   $(INNER_ROBOCOP_PACKAGE)
 
+# Language repacks root the resources contained in assets/omni.ja
+# under assets/, but the repacks expect them to be rooted at /.
+# Therefore, we we move the omnijar back to / so the resources are
+# under the root here, in INNER_UNMAKE_PACKAGE. See comments about
+# OMNIJAR_NAME earlier in this file and in configure.in.
+
 INNER_UNMAKE_PACKAGE	= \
   mkdir $(MOZ_PKG_DIR) && \
   ( cd $(MOZ_PKG_DIR) && \
     $(UNZIP) $(UNPACKAGE) && \
     mv lib/$(ABI_DIR)/libmozglue.so . && \
     mv lib/$(ABI_DIR)/*plugin-container* $(MOZ_CHILD_PROCESS_NAME) && \
-    rm -rf lib/$(ABI_DIR) )
+    rm -rf lib/$(ABI_DIR) \
+    $(if $(filter-out ./,$(OMNIJAR_DIR)), \
+      && mv $(OMNIJAR_DIR)$(OMNIJAR_NAME) $(OMNIJAR_NAME)) )
 endif
 
 ifeq ($(MOZ_PKG_FORMAT),DMG)
 PKG_SUFFIX	= .dmg
 PKG_DMG_FLAGS	=
 ifneq (,$(MOZ_PKG_MAC_DSSTORE))
 PKG_DMG_FLAGS += --copy "$(MOZ_PKG_MAC_DSSTORE):/.DS_Store"
 endif
@@ -579,18 +602,22 @@ MOZ_PACKAGER_FORMAT = $(error MOZ_PACKAG
 endif
 
 ifneq (android,$(MOZ_WIDGET_TOOLKIT))
 OPTIMIZEJARS = 1
 endif
 
 export NO_PKG_FILES USE_ELF_HACK ELF_HACK_FLAGS
 
+# Override the value of OMNIJAR_NAME from config.status with the value
+# set earlier in this file.
+
 stage-package: $(MOZ_PKG_MANIFEST)
 	@rm -rf $(DIST)/$(PKG_PATH)$(PKG_BASENAME).tar $(DIST)/$(PKG_PATH)$(PKG_BASENAME).dmg $@ $(EXCLUDE_LIST)
+	OMNIJAR_NAME=$(OMNIJAR_NAME) \
 	$(PYTHON) $(MOZILLA_DIR)/toolkit/mozapps/installer/packager.py $(DEFINES) \
 		--format $(MOZ_PACKAGER_FORMAT) \
 		$(addprefix --removals ,$(MOZ_PKG_REMOVALS)) \
 		$(if $(filter-out 0,$(MOZ_PKG_FATAL_WARNINGS)),,--ignore-errors) \
 		$(if $(MOZ_PACKAGER_MINIFY),--minify) \
 		$(if $(JARLOG_DIR),$(addprefix --jarlog ,$(wildcard $(JARLOG_FILE_AB_CD)))) \
 		$(if $(OPTIMIZEJARS),--optimizejars) \
 		$(addprefix --unify ,$(UNIFY_DIST)) \