This appears to be due to a race condition in startup well before anything related to app update. bug 1322554 comment #125
Summary: Intermittent TEST-UNEXPECTED-TIMEOUT | toolkit/mozapps/update/tests/unit_service_updater/marAppApplyUpdateAppBinInUseStageSuccessSvc_win.js | Test timed out → Intermittent TEST-UNEXPECTED-TIMEOUT | marAppApplyUpdateAppBinInUseStageSuccessSvc_win.js | Test timed out
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → INCOMPLETE
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