--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -262,16 +262,21 @@ pref("browser.search.jarURIs", "chrome:/
 // tell the search service that we don't really expose the "current engine"
 pref("browser.search.noCurrentEngine", true);
 
 #ifdef MOZ_OFFICIAL_BRANDING
 // {moz:official} expands to "official"
 pref("browser.search.official", true);
 #endif
 
+// Enable sparse localization by setting a few package locale overrides
+pref("chrome.override_package.global", "browser");
+pref("chrome.override_package.mozapps", "browser");
+pref("chrome.override_package.passwordmgr", "browser");
+
 // enable xul error pages
 pref("browser.xul.error_pages.enabled", true);
 
 // Specify emptyRestriction = 0 so that bookmarks appear in the list by default
 pref("browser.urlbar.default.behavior", 0);
 pref("browser.urlbar.default.behavior.emptyRestriction", 0);
 
 // Let the faviconservice know that we display favicons as 32x32px so that it

--- a/mobile/android/locales/jar.mn
+++ b/mobile/android/locales/jar.mn
@@ -23,9 +23,41 @@
   locale/@AB_CD@/browser/checkbox.dtd             (%chrome/checkbox.dtd)
   locale/@AB_CD@/browser/notification.dtd         (%chrome/notification.dtd)
   locale/@AB_CD@/browser/pippki.properties        (%chrome/pippki.properties)
   locale/@AB_CD@/browser/sync.dtd                 (%chrome/sync.dtd)
   locale/@AB_CD@/browser/sync.properties          (%chrome/sync.properties)
   locale/@AB_CD@/browser/prompt.dtd               (%chrome/prompt.dtd)
   locale/@AB_CD@/browser/feedback.dtd             (%chrome/feedback.dtd)
   locale/@AB_CD@/browser/phishing.dtd             (%chrome/phishing.dtd)
+
+# overrides for toolkit l10n, also for en-US
+relativesrcdir toolkit/locales:
+  locale/@AB_CD@/browser/overrides/about.dtd                       (%chrome/global/about.dtd)
+  locale/@AB_CD@/browser/overrides/aboutAbout.dtd                  (%chrome/global/aboutAbout.dtd)
+  locale/@AB_CD@/browser/overrides/aboutRights.dtd                 (%chrome/global/aboutRights.dtd)
+  locale/@AB_CD@/browser/overrides/commonDialogs.properties        (%chrome/global/commonDialogs.properties)
+  locale/@AB_CD@/browser/overrides/handling/handling.properties    (%chrome/mozapps/handling/handling.properties)
+  locale/@AB_CD@/browser/overrides/intl.properties                 (%chrome/global/intl.properties)
+  locale/@AB_CD@/browser/overrides/intl.css                        (%chrome/global/intl.css)
+  locale/@AB_CD@/browser/overrides/passwordmgr.properties          (%chrome/passwordmgr/passwordmgr.properties)
+  locale/@AB_CD@/browser/overrides/search/search.properties        (%chrome/search/search.properties)
+  locale/@AB_CD@/browser/overrides/update/updates.properties       (%chrome/mozapps/update/updates.properties)
+
+% override chrome://global/locale/about.dtd chrome://browser/locale/overrides/about.dtd
+% override chrome://global/locale/aboutAbout.dtd chrome://browser/locale/overrides/aboutAbout.dtd
+% override chrome://global/locale/aboutRights.dtd chrome://browser/locale/overrides/aboutRights.dtd
+% override chrome://global/locale/commonDialogs.properties chrome://browser/locale/overrides/commonDialogs.properties
+% override chrome://mozapps/locale/handling/handling.properties chrome://browser/locale/overrides/handling/handling.properties
+% override chrome://global/locale/intl.properties chrome://browser/locale/overrides/intl.properties
+% override chrome://global/locale/intl.css chrome://browser/locale/overrides/intl.css
+% override chrome://passwordmgr/locale/passwordmgr.properties chrome://browser/locale/overrides/passwordmgr/passwordmgr.properties
+% override chrome://global/locale/search/search.properties chrome://browser/locale/overrides/search/search.properties
+% override chrome://mozapps/locale/update/updates.properties chrome://browser/locale/overrides/update/updates.properties
+
+# overrides for dom l10n, also for en-US
+relativesrcdir dom/locales:
+  locale/@AB_CD@/browser/overrides/charsetTitles.properties    (%chrome/charsetTitles.properties)
+  locale/@AB_CD@/browser/overrides/global.dtd                  (%chrome/global.dtd)
+
+% override chrome://global/locale/charsetTitles.properties chrome://browser/locale/overrides/charsetTitles.properties
+% override chrome://global/locale/global.dtd chrome://browser/locale/overrides/global.dtd
   locale/@AB_CD@/browser/handling.properties      (%chrome/handling.properties)

--- a/mobile/locales/Makefile.in
+++ b/mobile/locales/Makefile.in
@@ -166,17 +166,16 @@ libs-%: $(libs-preqs)
 	@$(MAKE) -B $(bookmarks) AB_CD=$*
 	@$(MAKE) -B searchplugins AB_CD=$* XPI_NAME=locale-$*
 	@$(MAKE) libs AB_CD=$* XPI_NAME=locale-$* PREF_DIR=defaults/pref
 	@$(MAKE) -C $(DEPTH)/$(MOZ_BRANDING_DIRECTORY)/locales AB_CD=$* XPI_NAME=locale-$*
 
 # Tailored target to just add the chrome processing for multi-locale builds
 chrome-%:
 	$(display-deps)
-	@$(MAKE) -C $(DEPTH)/toolkit/locales chrome-$*
 	@$(MAKE) -B $(bookmarks) AB_CD=$*
 	@$(MAKE) -B searchplugins AB_CD=$*
 	@$(MAKE) chrome AB_CD=$*
 	@$(MAKE) -C $(DEPTH)/$(MOZ_BRANDING_DIRECTORY)/locales chrome AB_CD=$*
 
 NO_JA_JP_MAC_AB_CD := $(if $(filter ja-JP-mac, $(AB_CD)),ja,$(AB_CD))