--- Makefile.ori	2014-04-09 14:39:38.000000000 +0200
+++ Makefile	2014-04-25 10:30:31.000000000 +0200
@@ -15,7 +15,7 @@
 EXTRACT_DEPENDS=	zip:${PORTSDIR}/archivers/zip
 
 USES=		zip:infozip gecko:thunderbird
-USE_XPI=	firefox linux-firefox
+USE_XPI=	thunderbird
 
 NO_BUILD=	yes
 NO_ARCH=	yes