--- a/testing/marionette/harness/marionette_harness/tests/unit/unit-tests.ini
+++ b/testing/marionette/harness/marionette_harness/tests/unit/unit-tests.ini
@@ -50,17 +50,16 @@ skip-if = appname == 'fennec' || os == "
 
 [test_simpletest_pass.js]
 [test_simpletest_sanity.py]
 [test_simpletest_chrome.js]
 [test_simpletest_timeout.js]
 [test_anonymous_content.py]
 skip-if = appname == 'fennec'
 [test_switch_frame.py]
-skip-if = os == "win" # Bug 1078237
 [test_switch_frame_chrome.py]
 skip-if = appname == 'fennec'
 [test_switch_remote_frame.py]
 skip-if = appname == 'fennec'
 [test_switch_window_chrome.py]
 skip-if = appname == 'fennec'
 [test_switch_window_content.py]