Make firefox headless

src/conftest.py

@@ -13,6 +13,12 @@ def live_server(settings, live_server):
     return live_server
 
 
+@pytest.fixture()
+def firefox_options(firefox_options):
+    firefox_options.add_argument("-headless")
+    return firefox_options
+
+
 @pytest.fixture()
 def selenium(selenium):
     selenium.implicitly_wait(3)