diff --git a/www/xpi-flashblock/Makefile b/www/xpi-flashblock/Makefile
index 00bb9d349bd6..e15ff0468fb6 100644
--- a/www/xpi-flashblock/Makefile
+++ b/www/xpi-flashblock/Makefile
@@ -7,8 +7,8 @@
 
 PORTNAME=	flashblock
 PORTVERSION=	1.5.15.1
-PORTREVISION=	1
 DISTVERSIONSUFFIX=	-fx
+PORTREVISION=	2
 CATEGORIES=	www
 
 MAINTAINER=	barbara.xxx1975@libero.it
@@ -21,5 +21,12 @@ XPI_NUM=	433
 XPI_FILES=	chrome/flashblock.jar chrome.manifest defaults/preferences/flashblock.js install.rdf
 XPI_DIRS=	chrome defaults/preferences defaults
 
+post-patch:
+	@${REINPLACE_CMD} -e 's|<em:maxVersion>8\.0<|<em:maxVersion>99.*<|' \
+	    ${WRKSRC}/install.rdf
+
+pre-install:
+	@${RM} -f ${WRKSRC}/install.rdf.bak
+
 .include "${.CURDIR}/../xpi-adblock/Makefile.xpi"
 .include <bsd.port.mk>