diff -up firefox-16.0/mozilla-release/config/baseconfig.mk.old firefox-16.0/mozilla-release/config/baseconfig.mk
--- firefox-16.0/mozilla-release/config/baseconfig.mk.old	2012-10-08 20:38:31.119228352 +0200
+++ firefox-16.0/mozilla-release/config/baseconfig.mk	2012-10-08 20:38:57.618309057 +0200
@@ -2,7 +2,7 @@ INCLUDED_AUTOCONF_MK = 1
 
 includedir := $(includedir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
 idldir = $(datadir)/idl/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
-installdir = $(libdir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
+installdir = $(libdir)/$(MOZ_APP_NAME)
 sdkdir = $(libdir)/$(MOZ_APP_NAME)-devel-$(MOZ_APP_VERSION)
 DIST = $(DEPTH)/dist
 
diff -up firefox-16.0/mozilla-release/js/src/config/baseconfig.mk.old firefox-16.0/mozilla-release/js/src/config/baseconfig.mk
--- firefox-16.0/mozilla-release/js/src/config/baseconfig.mk.old	2012-10-08 20:38:37.756248430 +0200
+++ firefox-16.0/mozilla-release/js/src/config/baseconfig.mk	2012-10-08 20:39:15.974365249 +0200
@@ -1,6 +1,6 @@
 INCLUDED_AUTOCONF_MK = 1
 
-installdir = $(libdir)/$(MOZ_APP_NAME)-$(MOZ_APP_VERSION)
+installdir = $(libdir)/$(MOZ_APP_NAME)
 sdkdir = $(libdir)/$(MOZ_APP_NAME)-devel-$(MOZ_APP_VERSION)
 
 ifneq (,$(filter /%,$(TOP_DIST)))