diff --git a/extra/firefox/files/mozconfig b/extra/firefox/files/mozconfig
index 7efef6f8..c1975193 100644
--- a/extra/firefox/files/mozconfig
+++ b/extra/firefox/files/mozconfig
@@ -1,16 +1,15 @@
 ac_add_options --prefix=/usr
 ac_add_options --libdir=/usr/lib
 
-ac_add_options --with-system-nspr
-ac_add_options --with-system-nss
-ac_add_options --with-system-jpeg
-ac_add_options --with-system-zlib
-ac_add_options --with-system-bz2
-ac_add_options --with-system-libvpx
-# XXX: the system's libpng doesn't have APNG support
+ac_add_options --without-system-nspr
+ac_add_options --without-system-nss
+ac_add_options --without-system-jpeg
+ac_add_options --without-system-zlib
+ac_add_options --without-system-bz2
+ac_add_options --without-system-libvpx
 ac_add_options --without-system-png
-ac_add_options --enable-system-pixman
-ac_add_options --enable-system-ffi
+ac_add_options --without-system-pixman
+ac_add_options --without-system-ffi
 
 ac_add_options --disable-gconf
 ac_add_options --disable-install-strip