diff --git a/test/resources/firefox/prefs.js b/test/resources/firefox/prefs.js
new file mode 100644
index 000000000..8d59d66bd
--- /dev/null
+++ b/test/resources/firefox/prefs.js
@@ -0,0 +1 @@
+user_pref("browser.shell.checkDefaultBrowser", false);