Then there's this which was turning up this morning whenever I hit a "raw_input" statement I had in some non-web related Python code for debugging.
WARNING: At least one completion condition is taking too long to complete. Conditions: [{"name":"TelemetryController: shutting down","state":{"initialized":true,"initStarted":true,"haveDelayedInitTask":false,"shutdownBarrier":[{"name":"TelemetrySession: shutting down","state":{"initialized":true,"initStarted":true,"haveDelayedInitTask":true},"filename":"resource://gre/modules/TelemetrySession.jsm","lineNumber":1389,"stack":["resource://gre/modules/TelemetrySession.jsm:setupChromeProcess:1389","resource://gre/modules/TelemetrySession.jsm:Impl.observe:1791","resource://gre/modules/TelemetrySession.jsm:this.TelemetrySession<.observe:638","resource://gre/components/TelemetryStartup.js:TelemetryStartup.prototype.observe:31"]}],"connectionsBarrier":"Not started","sendModule":{"sendingEnabled":false,"pendingPingRequestCount":0,"pendingPingActivityCount":0,"unpersistedPingCount":0,"persistedPingCount":453,"schedulerState":{"shutdown":true,"hasSendTask":false,"sendsFailed":false,"sendTaskState":"bail out - no pings to send","backoffDelay":60000}}},"filename":"resource://gre/modules/TelemetryController.jsm","lineNumber":772,"stack":["resource://gre/modules/TelemetryController.jsm:setupTelemetry:772","resource://gre/modules/TelemetryController.jsm:Impl.observe:868","resource://gre/modules/TelemetryController.jsm:this.TelemetryController<.observe:198","resource://gre/components/TelemetryStartup.js:TelemetryStartup.prototype.observe:30"]}] Barrier: profile-before-change2
Where was it coming from? No clue. Something running in my ancient version of Opera I think.