kai.nissen added a comment.
Seems that @Pcoombe's comment regarding corrupt Firefox profiles points into the right direction. I could not reproduce this using any specific browser functionality, but can confirm that this only happens in Firefox. This error has been reported to logstash since Sep 23rd and at a much lower rate during earlier banner tests, probably because of the traffic limit. There is a spike in early October which coincides with the Wikipedia Challenge banners. TASK DETAIL https://phabricator.wikimedia.org/T267267 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: kai.nissen Cc: kai.nissen, Pcoombe, Urbanecm, Aklapper, Jdlrobson, EgbeRef, Vaibhav0199, Akuckartz, JanJaquemot, Tobias_Schumann_WMDE-ext, Tinzawoo533, darthmon_wmde, Onmir, DannyS712, Nandana, Mh-3110, Amorymeltzer, Lahi, Gq86, tmletzko, GoranSMilovanovic, Jayprakash12345, QZanden, enigmaeth, rohitt, LawExplorer, _jensen, rosalieper, gabriel-wmde, Scott_WUaS, Dixtosa, Verdy_p, Wikidata-bugs, aude, Dinoguy1000, Jdforrester-WMF, Mbch331, Rxy, Jay8g
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