Filed by: ccozmuta [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=380038199&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/YCXg8PapT_izRHt7VkRLIQ/runs/0/artifacts/public/logs/live_backing.log
Reftest URL: https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/YCXg8PapT_izRHt7VkRLIQ/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

[task 2022-06-02T15:34:04.647Z] 15:34:04     INFO - TEST-START | devtools/client/webconsole/test/browser/browser_console_enable_network_monitoring.js
[task 2022-06-02T15:34:04.995Z] 15:34:04     INFO - TEST-INFO | started process screenshot
[task 2022-06-02T15:34:05.148Z] 15:34:05     INFO - TEST-INFO | screenshot: exit 0
[task 2022-06-02T15:34:05.158Z] 15:34:05     INFO - Buffered messages logged at 15:34:04
[task 2022-06-02T15:34:05.159Z] 15:34:05     INFO - Entering test bound testEnableNetworkMonitoringInBrowserConsole
[task 2022-06-02T15:34:05.160Z] 15:34:05     INFO - Console message: [JavaScript Warning: "The Web Console logging API (console.log, console.info, console.warn, console.error) has been disabled by a script on this page."]
[task 2022-06-02T15:34:05.160Z] 15:34:05     INFO - Buffered messages logged at 15:34:05
[task 2022-06-02T15:34:05.161Z] 15:34:05     INFO - Set the focus on the Browser Console
[task 2022-06-02T15:34:05.161Z] 15:34:05     INFO - Setting the netxhr category to checked
[task 2022-06-02T15:34:05.162Z] 15:34:05     INFO - Setting the net category to checked
[task 2022-06-02T15:34:05.162Z] 15:34:05     INFO - Check that the 'Enable Network Monitoring' setting is off by default
[task 2022-06-02T15:34:05.163Z] 15:34:05     INFO - Buffered messages finished
[task 2022-06-02T15:34:05.164Z] 15:34:05     INFO - TEST-UNEXPECTED-FAIL | devtools/client/webconsole/test/browser/browser_console_enable_network_monitoring.js | setting is disabled - 
[task 2022-06-02T15:34:05.164Z] 15:34:05     INFO - Stack trace:
[task 2022-06-02T15:34:05.164Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-06-02T15:34:05.164Z] 15:34:05     INFO - chrome://mochitests/content/browser/devtools/client/webconsole/test/browser/head.js:checkConsoleSettingState:477
[task 2022-06-02T15:34:05.165Z] 15:34:05     INFO - chrome://mochitests/content/browser/devtools/client/webconsole/test/browser/browser_console_enable_network_monitoring.js:testEnableNetworkMonitoringInBrowserConsole:30
[task 2022-06-02T15:34:05.165Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:handleTask:989
[task 2022-06-02T15:34:05.165Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1061
[task 2022-06-02T15:34:05.165Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1189
[task 2022-06-02T15:34:05.165Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:972
[task 2022-06-02T15:34:05.165Z] 15:34:05     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1041
[task 2022-06-02T15:34:05.166Z] 15:34:05     INFO - Checking that "test-image.png" was not logged
[task 2022-06-02T15:34:05.166Z] 15:34:05     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - TEST-UNEXPECTED-FAIL | devtools/client/webconsole/test/browser/browser_console_enable_network_monitoring.js | "test-image.png" was logged once - 
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - Stack trace:
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:test_ok:1394
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - chrome://mochitests/content/browser/devtools/client/webconsole/test/browser/browser_console_enable_network_monitoring.js:checkNoMessageExists:142
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - chrome://mochitests/content/browser/devtools/client/webconsole/test/browser/browser_console_enable_network_monitoring.js:testEnableNetworkMonitoringInBrowserConsole:34
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:handleTask:989
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1061
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1189
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:972
[task 2022-06-02T15:34:05.168Z] 15:34:05     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1041
[task 2022-06-02T15:34:05.169Z] 15:34:05     INFO - Turn on network monitoring
[task 2022-06-02T15:34:13.572Z] 15:34:13     INFO - Not taking screenshot here: see the one that was previously logged
[task 2022-06-02T15:34:13.579Z] 15:34:13     INFO - TEST-UNEXPECTED-FAIL | devtools/client/webconsole/test/browser/browser_console_enable_network_monitoring.js | Uncaught exception in test - at chrome://mochitests/content/browser/devtools/client/shared/test/shared-head.js:1056 - Error: Failed waitFor():  
[task 2022-06-02T15:34:13.579Z] 15:34:13     INFO - Failed condition: () => {
[task 2022-06-02T15:34:13.579Z] 15:34:13     INFO -     const el = getConsoleSettingElement(hud, enableNetworkMonitoringSelector);
[task 2022-06-02T15:34:13.579Z] 15:34:13     INFO -     return el.getAttribute("aria-checked") === "true";
[task 2022-06-02T15:34:13.579Z] 15:34:13     INFO -   } 
[task 2022-06-02T15:34:13.579Z] 15:34:13     INFO - Exception Message:  - timed out after 500 tries.
[task 2022-06-02T15:34:13.579Z] 15:34:13     INFO - Stack trace:
[task 2022-06-02T15:34:13.579Z] 15:34:13     INFO - waitFor@chrome://mochitests/content/browser/devtools/client/shared/test/shared-head.js:1056:11
<...>
[task 2022-06-02T15:34:14.142Z] 15:34:14     INFO - Console message: [JavaScript Error: "Content Security Policy: The pages settings blocked the loading of a resource at inline (default-src)." {file: "chrome" line: 511}]
[task 2022-06-02T15:34:14.143Z] 15:34:14     INFO - Console message: [JavaScript Error: "Content Security Policy: The pages settings blocked the loading of a resource at inline (default-src)." {file: "chrome" line: 62}]
[task 2022-06-02T15:34:14.258Z] 15:34:14     INFO - Toolbox opened and focused
[task 2022-06-02T15:34:14.262Z] 15:34:14     INFO - TEST-PASS | devtools/client/webconsole/test/browser/browser_console_enable_network_monitoring.js | The 'Enable Network Monitoring' setting item should not be avaliable in the webconsole - 
[task 2022-06-02T15:34:14.263Z] 15:34:14     INFO - Leaving test bound testEnableNetworkMonitoringInWebConsole

:bomsy, since you are the author of the regressor, bug 1764348, could you take a look?
For more information, please visit auto_nag documentation.

Fixed by backout - backout link