It looks like this is coming from BrowserGlue.jsm in this chain of events: - observer notification received: https://searchfox.org/mozilla-central/source/browser/components/BrowserGlue.jsm#865 - calls _onWindowsRestored: https://searchfox.org/mozilla-central/source/browser/components/BrowserGlue.jsm#1977 - calls Services.tm.idleDispatchToMainThread() of a lambda that calls PushService.wrappedJSObject.ensureReady() at https://searchfox.org/mozilla-central/source/browser/components/BrowserGlue.jsm#2042 Since it's in a lambda, it doesn't actually break anything, but the error is annoying. Moving to Firefox :: General which is what searchfox thinks BrowserGlue.jsm belongs to per in-tree mappings.
Bug 1591259 Comment 8 Edit History
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It looks like this is coming from BrowserGlue.jsm in this chain of events: - observer notification received: https://searchfox.org/mozilla-central/rev/3300072e993ae05d50d5c63d815260367eaf9179/browser/components/BrowserGlue.jsm#865 - calls _onWindowsRestored: https://searchfox.org/mozilla-central/rev/3300072e993ae05d50d5c63d815260367eaf9179/browser/components/BrowserGlue.jsm#1984 - calls Services.tm.idleDispatchToMainThread() of a lambda that calls PushService.wrappedJSObject.ensureReady() at https://searchfox.org/mozilla-central/rev/3300072e993ae05d50d5c63d815260367eaf9179/browser/components/BrowserGlue.jsm#2049 Since it's in a lambda, it doesn't actually break anything, but the error is annoying. Moving to Firefox :: General which is what searchfox thinks BrowserGlue.jsm belongs to per in-tree mappings.