This was permafailing. The retiggers that you did are not running the test that is failing - access the log for a green retrigger and search ```browser/components/extensions/test/browser/browser_ext_windows_create_url.js``` - you will see that that job did not run the test. In the link you provided, you will see a job that failed, [this one](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception%2Crunnable&searchStr=windows%2C11%2Cx86%2C22h2%2Cwebrender%2Copt%2Cmochitests%2Ctest-windows11-32-2009-qr%2Fopt-mochitest-browser-chrome%2Cbc5&revision=5f5354d30a45cfde74c4a42d0c4cf74060224e8c&selectedTaskRun=c4RLD6abTUa7WN4ItiPQTw.0) , this ran the test and it failed, that is how I found that this was causing permafailures.
Bug 1783521 Comment 10 Edit History
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This was permafailing. The retiggers that you did are not running the test that is failing - access the log for a green retrigger and search for ```browser/components/extensions/test/browser/browser_ext_windows_create_url.js``` - you will see that that job did not run the test. In the link you provided, you will see a job that failed, [this one](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception%2Crunnable&searchStr=windows%2C11%2Cx86%2C22h2%2Cwebrender%2Copt%2Cmochitests%2Ctest-windows11-32-2009-qr%2Fopt-mochitest-browser-chrome%2Cbc5&revision=5f5354d30a45cfde74c4a42d0c4cf74060224e8c&selectedTaskRun=c4RLD6abTUa7WN4ItiPQTw.0) , this ran the test and it failed, that is how I found that this was causing permafailures.
This was permafailing. The retiggers that you did are not running the test that is failing - access the log for a green retrigger and search for ```browser/components/extensions/test/browser/browser_ext_windows_create_url.js``` - you will see that the job did not run the test. In the link you provided, you will see a job that failed, [this one](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception%2Crunnable&searchStr=windows%2C11%2Cx86%2C22h2%2Cwebrender%2Copt%2Cmochitests%2Ctest-windows11-32-2009-qr%2Fopt-mochitest-browser-chrome%2Cbc5&revision=5f5354d30a45cfde74c4a42d0c4cf74060224e8c&selectedTaskRun=c4RLD6abTUa7WN4ItiPQTw.0) , this ran the test and it failed, that is how I found that this was causing permafailures.