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