--- a/testing/marionette/harness/marionette_harness/tests/unit/unit-tests.ini
+++ b/testing/marionette/harness/marionette_harness/tests/unit/unit-tests.ini
@@ -33,17 +33,17 @@ skip-if = appname == 'fennec'
 [test_execute_async_script.py]
 [test_execute_script.py]
 [test_element_retrieval.py]
 [test_findelement_chrome.py]
 skip-if = appname == 'fennec'
 
 [test_get_current_url_chrome.py]
 [test_navigation.py]
-
+skip-if = appname == 'fennec' && debug # Bug 1454680
 [test_timeouts.py]
 
 [test_single_finger_desktop.py]
 skip-if = appname == 'fennec' || os == "win" # Bug 1025040
 
 [test_anonymous_content.py]
 skip-if = appname == 'fennec'
 [test_switch_frame.py]