I just checked [several Mochitests as run on macOS 11.2.3](https://treeherder.mozilla.org/jobs?repo=mozilla-central&searchStr=mac%2Copt%2Cmochitest%2Caarch64) and they all [do NOT show this startup delay](https://treeherder.mozilla.org/logviewer?job_id=481341191&repo=mozilla-central&lineNumber=3841-3845): ``` [task 2024-11-05T23:51:15.618Z] 23:51:15 INFO - Application command: /opt/worker/tasks/task_173085033658563/build/application/Firefox Nightly.app/Contents/MacOS/firefox -marionette -foreground -profile /var/folders/cr/5_z7mtts3jb6l848j8glx824000014/T/tmp4rxvfiry.mozrunner [task 2024-11-05T23:51:15.620Z] 23:51:15 INFO - runtests.py | Application pid: 2097 [task 2024-11-05T23:51:15.620Z] 23:51:15 INFO - TEST-INFO | started process GECKO(2097) [task 2024-11-05T23:51:15.803Z] 23:51:15 INFO - GECKO(2097) | 1730850675802 Marionette INFO Marionette enabled [task 2024-11-05T23:51:15.899Z] 23:51:15 INFO - GECKO(2097) | 1730850675899 Marionette TRACE Received observer notification final-ui-startup ```
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I just checked [several Mochitests as run on macOS 11.2.3 (aarch64)](https://treeherder.mozilla.org/jobs?repo=mozilla-central&searchStr=mac%2Copt%2Cmochitest%2Caarch64) and they all [do NOT show this startup delay](https://treeherder.mozilla.org/logviewer?job_id=481341191&repo=mozilla-central&lineNumber=3841-3845): ``` [task 2024-11-05T23:51:15.618Z] 23:51:15 INFO - Application command: /opt/worker/tasks/task_173085033658563/build/application/Firefox Nightly.app/Contents/MacOS/firefox -marionette -foreground -profile /var/folders/cr/5_z7mtts3jb6l848j8glx824000014/T/tmp4rxvfiry.mozrunner [task 2024-11-05T23:51:15.620Z] 23:51:15 INFO - runtests.py | Application pid: 2097 [task 2024-11-05T23:51:15.620Z] 23:51:15 INFO - TEST-INFO | started process GECKO(2097) [task 2024-11-05T23:51:15.803Z] 23:51:15 INFO - GECKO(2097) | 1730850675802 Marionette INFO Marionette enabled [task 2024-11-05T23:51:15.899Z] 23:51:15 INFO - GECKO(2097) | 1730850675899 Marionette TRACE Received observer notification final-ui-startup ```