diff -up firefox-73.0/build/unix/run-mozilla.sh.old firefox-73.0/build/unix/run-mozilla.sh
--- firefox-73.0/build/unix/run-mozilla.sh.old	2020-02-12 09:58:00.150895904 +0100
+++ firefox-73.0/build/unix/run-mozilla.sh	2020-02-12 09:58:06.505860696 +0100
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/sh
 #
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this