Reported on IRC in Commons. Edit any file description page and save it, then you get two Media Viewer buttons.
Description
Description
Event Timeline
MarkTraceur subscribed.
Restricted Application added a project: Multimedia. · View Herald TranscriptAug 31 2015, 5:02 PM2015-08-31 17:02:15 (UTC+0)
matmarex closed this task as a duplicate of T110493: "Open in Media Viewer" box appears twice after editing file page.Aug 31 2015, 5:11 PM2015-08-31 17:11:16 (UTC+0)
Restricted Application added a subscriber: Matanya. · View Herald TranscriptAug 31 2015, 5:11 PM2015-08-31 17:11:16 (UTC+0)