Bug: Intermittent browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA after further search -
Status: RESOLVED
Priority: P5
Resolution: FIXED
Created: 2021-08-04 15:58:00+00:00
Resolved: 2021-08-31 11:08:00+00:00

**Filed by:** malexandru [at] mozilla.com
**Parsed log:** https://treeherder.mozilla.org/logviewer?job_id=347386931&repo=autoland
**Full log:** https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/a5edmNs6Q_6ao4K8Vv6M4g/runs/0/artifacts/public/logs/live_backing.log

---
```
[task 2021-08-04T14:54:16.478Z] 14:54:16     INFO - TEST-START | browser/components/preferences/tests/browser_experimental_features_filter.js
[task 2021-08-04T14:54:17.761Z] 14:54:17     INFO - TEST-INFO | started process screenshot
[task 2021-08-04T14:54:17.955Z] 14:54:17     INFO - TEST-INFO | screenshot: exit 0
[task 2021-08-04T14:54:17.956Z] 14:54:17     INFO - Buffered messages logged at 14:54:16
[task 2021-08-04T14:54:17.956Z] 14:54:17     INFO - Entering test bound testFilterFeatures
[task 2021-08-04T14:54:17.957Z] 14:54:17     INFO - Buffered messages logged at 14:54:17
[task 2021-08-04T14:54:17.957Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.958Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA not initially hidden - 
[task 2021-08-04T14:54:17.958Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.958Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB not initially hidden - 
[task 2021-08-04T14:54:17.959Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.959Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC not initially hidden - 
[task 2021-08-04T14:54:17.960Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.960Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD not initially hidden - 
[task 2021-08-04T14:54:17.961Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.961Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA after first search - 
[task 2021-08-04T14:54:17.962Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.962Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB after first search - 
[task 2021-08-04T14:54:17.963Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.963Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC after first search - 
[task 2021-08-04T14:54:17.963Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.964Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD after first search - 
[task 2021-08-04T14:54:17.964Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.965Z] 14:54:17     INFO - Buffered messages finished
[task 2021-08-04T14:54:17.966Z] 14:54:17     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA after further search - 
[task 2021-08-04T14:54:17.966Z] 14:54:17     INFO - Stack trace:
[task 2021-08-04T14:54:17.966Z] 14:54:17     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:17.966Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:17.966Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:17.966Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:95
[task 2021-08-04T14:54:17.966Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.967Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB after further search - 
[task 2021-08-04T14:54:17.967Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.968Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC after further search - 
[task 2021-08-04T14:54:17.968Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.969Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD after further search - 
[task 2021-08-04T14:54:17.969Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.969Z] 14:54:17     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:17.970Z] 14:54:17     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA not hidden after search cleared - 
[task 2021-08-04T14:54:17.970Z] 14:54:17     INFO - Stack trace:
[task 2021-08-04T14:54:17.970Z] 14:54:17     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:17.970Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:17.970Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:17.970Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:116
[task 2021-08-04T14:54:17.971Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.971Z] 14:54:17     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:17.972Z] 14:54:17     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB not hidden after search cleared - 
[task 2021-08-04T14:54:17.972Z] 14:54:17     INFO - Stack trace:
[task 2021-08-04T14:54:17.972Z] 14:54:17     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:17.972Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:17.972Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:17.972Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:116
[task 2021-08-04T14:54:17.973Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.973Z] 14:54:17     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:17.974Z] 14:54:17     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC not hidden after search cleared - 
[task 2021-08-04T14:54:17.974Z] 14:54:17     INFO - Stack trace:
[task 2021-08-04T14:54:17.974Z] 14:54:17     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:17.974Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:17.974Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:17.974Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:116
[task 2021-08-04T14:54:17.975Z] 14:54:17     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:17.975Z] 14:54:17     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:17.976Z] 14:54:17     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD not hidden after search cleared - 
[task 2021-08-04T14:54:17.976Z] 14:54:17     INFO - Stack trace:
[task 2021-08-04T14:54:17.976Z] 14:54:17     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:17.976Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:17.976Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:17.976Z] 14:54:17     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:116
[task 2021-08-04T14:54:18.775Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:18.776Z] 14:54:18     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:18.777Z] 14:54:18     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA after next search - 
[task 2021-08-04T14:54:18.777Z] 14:54:18     INFO - Stack trace:
[task 2021-08-04T14:54:18.777Z] 14:54:18     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:18.777Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:18.777Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:18.777Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:129
[task 2021-08-04T14:54:18.778Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:18.778Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB after next search - 
[task 2021-08-04T14:54:18.779Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:18.779Z] 14:54:18     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:18.780Z] 14:54:18     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC after next search - 
[task 2021-08-04T14:54:18.780Z] 14:54:18     INFO - Stack trace:
[task 2021-08-04T14:54:18.780Z] 14:54:18     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:18.780Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:18.780Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:18.780Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:129
[task 2021-08-04T14:54:18.781Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:18.781Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD after next search - 
[task 2021-08-04T14:54:18.800Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:18.801Z] 14:54:18     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:18.802Z] 14:54:18     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA not hidden after category change to category-search - 
[task 2021-08-04T14:54:18.802Z] 14:54:18     INFO - Stack trace:
[task 2021-08-04T14:54:18.802Z] 14:54:18     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:18.802Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:18.802Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:18.803Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:143
[task 2021-08-04T14:54:18.803Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:18.803Z] 14:54:18     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:18.804Z] 14:54:18     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB not hidden after category change to category-search - 
[task 2021-08-04T14:54:18.804Z] 14:54:18     INFO - Stack trace:
[task 2021-08-04T14:54:18.804Z] 14:54:18     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:18.804Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:18.804Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:18.805Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:143
[task 2021-08-04T14:54:18.805Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:18.805Z] 14:54:18     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:18.806Z] 14:54:18     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC not hidden after category change to category-search - 
[task 2021-08-04T14:54:18.806Z] 14:54:18     INFO - Stack trace:
[task 2021-08-04T14:54:18.806Z] 14:54:18     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:18.806Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:18.806Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:18.807Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:143
[task 2021-08-04T14:54:18.807Z] 14:54:18     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:18.807Z] 14:54:18     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:18.808Z] 14:54:18     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD not hidden after category change to category-search - 
[task 2021-08-04T14:54:18.808Z] 14:54:18     INFO - Stack trace:
[task 2021-08-04T14:54:18.808Z] 14:54:18     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:18.808Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:18.808Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:18.808Z] 14:54:18     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:143
[task 2021-08-04T14:54:19.589Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:19.590Z] 14:54:19     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:19.591Z] 14:54:19     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA after next search - 
[task 2021-08-04T14:54:19.591Z] 14:54:19     INFO - Stack trace:
[task 2021-08-04T14:54:19.591Z] 14:54:19     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:19.591Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:19.591Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:19.591Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:129
[task 2021-08-04T14:54:19.592Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:19.592Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB after next search - 
[task 2021-08-04T14:54:19.593Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:19.593Z] 14:54:19     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:19.595Z] 14:54:19     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC after next search - 
[task 2021-08-04T14:54:19.595Z] 14:54:19     INFO - Stack trace:
[task 2021-08-04T14:54:19.595Z] 14:54:19     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:19.595Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:19.595Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:19.595Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:129
[task 2021-08-04T14:54:19.595Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:19.596Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD after next search - 
[task 2021-08-04T14:54:19.632Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:19.633Z] 14:54:19     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:19.634Z] 14:54:19     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureA not hidden after category change to category-experimental - 
[task 2021-08-04T14:54:19.634Z] 14:54:19     INFO - Stack trace:
[task 2021-08-04T14:54:19.634Z] 14:54:19     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:19.634Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:19.634Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:19.634Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:143
[task 2021-08-04T14:54:19.635Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:19.635Z] 14:54:19     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:19.636Z] 14:54:19     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureB not hidden after category change to category-experimental - 
[task 2021-08-04T14:54:19.636Z] 14:54:19     INFO - Stack trace:
[task 2021-08-04T14:54:19.636Z] 14:54:19     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:19.636Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:19.637Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:19.637Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:143
[task 2021-08-04T14:54:19.637Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:19.637Z] 14:54:19     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:19.638Z] 14:54:19     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureC not hidden after category change to category-experimental - 
[task 2021-08-04T14:54:19.638Z] 14:54:19     INFO - Stack trace:
[task 2021-08-04T14:54:19.638Z] 14:54:19     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:19.639Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:19.639Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:19.639Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:143
[task 2021-08-04T14:54:19.639Z] 14:54:19     INFO - TEST-PASS | browser/components/preferences/tests/browser_experimental_features_filter.js | Element should not be null, when checking visibility - 
[task 2021-08-04T14:54:19.639Z] 14:54:19     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-08-04T14:54:19.640Z] 14:54:19     INFO - TEST-UNEXPECTED-FAIL | browser/components/preferences/tests/browser_experimental_features_filter.js | item test-featureD not hidden after category change to category-experimental - 
[task 2021-08-04T14:54:19.640Z] 14:54:19     INFO - Stack trace:
[task 2021-08-04T14:54:19.640Z] 14:54:19     INFO - chrome://mochikit/content/browser-test.js:test_ok:1343
[task 2021-08-04T14:54:19.640Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/head.js:is_element_visible:12
[task 2021-08-04T14:54:19.640Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:checkVisibility:159
[task 2021-08-04T14:54:19.640Z] 14:54:19     INFO - chrome://mochitests/content/browser/browser/components/preferences/tests/browser_experimental_features_filter.js:testFilterFeatures:143
[task 2021-08-04T14:54:19.726Z] 14:54:19     INFO - Leaving test bound testFilterFeatures
[task 2021-08-04T14:54:19.847Z] 14:54:19     INFO - GECKO(10408) | MEMORY STAT | vsize 19406388MB | vsizeMaxContiguous 65010442MB | residentFast 1577MB
[task 2021-08-04T14:54:19.848Z] 14:54:19     INFO - TEST-OK | browser/components/preferences/tests/browser_experimental_features_filter.js | took 3369ms
[task 2021-08-04T14:54:19.870Z] 14:54:19     INFO - checking window state
[task 2021-08-04T14:54:20.188Z] 14:54:20     INFO - TEST-START | browser/components/preferences/tests/browser_experimental_features_hidden_when_not_public.js
```