diff -up firefox-29.0/mozilla-release/config/baseconfig.mk.orig firefox-29.0/mozilla-release/config/baseconfig.mk
--- mozilla-release/config/baseconfig.mk.orig	2014-04-22 15:38:52.948165295 +0200
+++ mozilla-release/config/baseconfig.mk	2014-04-22 15:42:20.387481673 +0200
@@ -4,7 +4,7 @@
 # whether a normal build is happening or whether the check is running.
 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)
 ifndef TOP_DIST
 TOP_DIST = dist