--- /usr/portage/www-client/firefox/firefox-68.0.ebuild	2019-07-11 16:46:16.314390026 +0900
+++ /usr/portage/www-client/firefox/firefox-67.0.4.ebuild	2019-06-21 04:00:53.529835299 +0900
@@ -276,6 +270,12 @@
 		|| die "sed failed to drop --as-needed for ia64"
 	fi
 
+	# Ensure that our plugins dir is enabled as default
+	sed -i -e "s:/usr/lib/mozilla/plugins:/usr/lib/nsbrowser/plugins:" \
+		"${S}"/xpcom/io/nsAppFileLocationProvider.cpp || die "sed failed to replace plugin path for 32bit!"
+	sed -i -e "s:/usr/lib64/mozilla/plugins:/usr/lib64/nsbrowser/plugins:" \
+		"${S}"/xpcom/io/nsAppFileLocationProvider.cpp || die "sed failed to replace plugin path for 64bit!"
+
 	# Fix sandbox violations during make clean, bug 372817
 	sed -e "s:\(/no-such-file\):${T}\1:g" \
 		-i "${S}"/config/rules.mk \