diff -Nur xpi-modify_headers.orig/Makefile xpi-modify_headers/Makefile
--- xpi-modify_headers.orig/Makefile	2011-07-03 23:35:49.000000000 +0200
+++ xpi-modify_headers/Makefile	2011-07-03 23:54:30.000000000 +0200
@@ -8,6 +8,7 @@
 PORTNAME=	modify_headers
 PORTVERSION=	0.7.0.2
 DISTVERSIONSUFFIX=	-fx+sm
+PORTREVISION=	1
 CATEGORIES=	www
 
 MAINTAINER=	kamikaze@bsdforen.de
@@ -65,5 +66,8 @@
 		defaults/preferences \
 		defaults
 
+post-patch:
+		@${FIND} ${WRKSRC} -name \*.orig -exec ${RM} \{} \;
+
 .include "../xpi-adblock/Makefile.xpi"
 .include <bsd.port.mk>
diff -Nur xpi-modify_headers.orig/files/patch-install.rdf xpi-modify_headers/files/patch-install.rdf
--- xpi-modify_headers.orig/files/patch-install.rdf	1970-01-01 01:00:00.000000000 +0100
+++ xpi-modify_headers/files/patch-install.rdf	2011-07-03 23:38:03.000000000 +0200
@@ -0,0 +1,11 @@
+--- install.rdf.orig	2011-07-03 23:37:16.000000000 +0200
++++ install.rdf	2011-07-03 23:37:28.000000000 +0200
+@@ -21,7 +21,7 @@
+             <Description>
+                 <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
+                 <em:minVersion>3.6</em:minVersion>
+-                <em:maxVersion>4.0.*</em:maxVersion>
++                <em:maxVersion>6.*</em:maxVersion>
+             </Description>
+         </em:targetApplication>
+