The PreferenceExperiments.jsm is getting initialized during shutdown, when it's not necessary. This has been seen in a Marionette test that quickly requests quitting Firefox once it finished startup: Here the appropriate excerpt from the log: https://treeherder.mozilla.org/logviewer?job_id=407440882&repo=autoland&lineNumber=46252 ``` [task 2023-03-01T15:47:13.741Z] 15:47:13 INFO - JavaScript error: resource://gre/modules/AsyncShutdown.sys.mjs, line 727: Error: Phase "IOUtils: waiting for profileBeforeChange IO to complete" is finished, it is too late to register completion condition "JSON store: writing data for 'shieldpreferenceexperiments'" ```
Bug 1820111 Comment 0 Edit History
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The PreferenceExperiments.jsm is getting initialized during shutdown, when it's not necessary. This has been seen in a Marionette test that quickly requests quitting Firefox once it finished startup: Here the appropriate excerpt from the log: https://treeherder.mozilla.org/logviewer?job_id=407440882&repo=autoland&lineNumber=46252 ``` [task 2023-03-01T15:47:13.741Z] 15:47:13 INFO - JavaScript error: resource://gre/modules/AsyncShutdown.sys.mjs, line 727: Error: Phase "IOUtils: waiting for profileBeforeChange IO to complete" is finished, it is too late to register completion condition "JSON store: writing data for 'shieldpreferenceexperiments'" ``` For details also see bug 1819671 comment 5.