diff --git a/tests/ui/conftest.py b/tests/ui/conftest.py
index a8e9490033..63fe8bca69 100644
--- a/tests/ui/conftest.py
+++ b/tests/ui/conftest.py
@@ -32,6 +32,7 @@ def firefox_options(firefox_options):
     firefox_options.set_preference('xpinstall.signatures.required', False)
     firefox_options.set_preference('extensions.webapi.testing', True)
     firefox_options.set_preference('ui.popup.disable_autohide', True)
+    firefox_options.set_preference('devtools.console.stdout.content', True)
     firefox_options.add_argument('-foreground')
     firefox_options.log.level = 'trace'
     return firefox_options