diff --git a/mozilla/build/pgo/automation.py.in b/mozilla/build/pgo/automation.py.in
index 03ecebebc79..58dc21600c7 100644
--- a/mozilla/build/pgo/automation.py.in
+++ b/mozilla/build/pgo/automation.py.in
@@ -189,6 +189,7 @@ user_pref("security.warn_submit_insecure", false);
 user_pref("browser.shell.checkDefaultBrowser", false);
 user_pref("browser.warnOnQuit", false);
 user_pref("accessibility.typeaheadfind.autostart", false);
+user_pref("javascript.options.showInConsole", true);
 """
   prefs.append(part)
 
diff --git a/mozilla/testing/mochitest/runtests.pl.in b/mozilla/testing/mochitest/runtests.pl.in
index c02431c3031..f56207ff1b7 100644
--- a/mozilla/testing/mochitest/runtests.pl.in
+++ b/mozilla/testing/mochitest/runtests.pl.in
@@ -436,6 +436,8 @@ user_pref("signed.applets.codebase_principal_support", true);
 user_pref("security.warn_submit_insecure", false);
 user_pref("browser.shell.checkDefaultBrowser", false);
 user_pref("browser.warnOnQuit", false);
+user_pref("accessibility.typeaheadfind.autostart", false);
+user_pref("javascript.options.showInConsole", true);
 PREFEND
 
   # Grant God-power to all the servers on which tests can run.