Quite not sure what is happening there, might be more related to bug 1791675 than this one. Can you check the value of `argv` in https://searchfox.org/comm-central/rev/d6d09ef935d8da3fc484514178638167b7460ac4/mozilla/toolkit/components/backgroundtasks/BackgroundTasksRunner.cpp#57 ? And perhaps what happens if you comment out [line 33](https://searchfox.org/comm-central/rev/d6d09ef935d8da3fc484514178638167b7460ac4/mozilla/toolkit/components/backgroundtasks/BackgroundTasksRunner.cpp#33)?
Bug 1794581 Comment 17 Edit History
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Quite not sure what is happening there, might be more related to bug 1791675 than this one. Can you check the value of `argv` in https://searchfox.org/comm-central/rev/d6d09ef935d8da3fc484514178638167b7460ac4/mozilla/toolkit/components/backgroundtasks/BackgroundTasksRunner.cpp#47 ? And perhaps what happens if you comment out [line 33](https://searchfox.org/comm-central/rev/d6d09ef935d8da3fc484514178638167b7460ac4/mozilla/toolkit/components/backgroundtasks/BackgroundTasksRunner.cpp#33)?