diff --git a/HACKING.md b/HACKING.md
index a80525afe..1b5fc8f6c 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -264,7 +264,7 @@ executed (red).
 Inside the container run
 
 ```bash
-guest$ cd /freedombox ; sudo functional_tests/install.sh
+guest$ cd /freedombox ; sudo plinth/tests/functional/install.sh
 ```
 
 #### For running tests inside the VM
diff --git a/plinth/tests/functional/install.sh b/plinth/tests/functional/install.sh
index a2355a755..6aaba28ca 100755
--- a/plinth/tests/functional/install.sh
+++ b/plinth/tests/functional/install.sh
@@ -5,7 +5,7 @@ IFS=$'\n\t'
 echo "Installing requirements"
 sudo apt-get install -yq --no-install-recommends \
     python3-pytest python3-pytest-django \
-    python3-pip firefox smbclient\
+    python3-pip firefox-esr smbclient\
     xvfb
 pip3 install wheel
 pip3 install splinter pytest-splinter pytest-bdd pytest-xvfb pytest-xdist