diff --git a/roles/firefox/files/syspref.js b/roles/firefox/files/syspref.js
new file mode 100644
index 0000000..9617a8f
--- /dev/null
+++ b/roles/firefox/files/syspref.js
@@ -0,0 +1,2 @@
+pref("browser.sessionstore.interval", 300000);
+pref("browser.cache.disk.enable", false);
diff --git a/roles/firefox/tasks/main_lin.yml b/roles/firefox/tasks/main_lin.yml
index fa3fd83..9cc1e51 100644
--- a/roles/firefox/tasks/main_lin.yml
+++ b/roles/firefox/tasks/main_lin.yml
@@ -41,3 +41,8 @@
   copy:
     dest: /etc/firefox/policies/policies.json
     src: policies.json
+
+- name: Set Firefox settings
+  copy:
+    dest: /etc/firefox/syspref.js
+    src: syspref.js