https://en.wikipedia.org/wiki/User:Masssly

Re:

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I have no idea what that would be: assuming you're only accessing via official Wikimedia addresses, that could be a user script or gadget, or a browser plugin, or something else, but doesn't look like any WMF software is related to that. The quickest way to find out would be capturing a screenshot and reporting it to en:Wikipedia:Village pump (technical). HTH! --Elitre (WMF) (talk) 18:02, 3 February 2015 (UTC)Reply

@Masssly: Hi, re: User_talk:Elitre_(WMF)#Bouncy_little_Ball: if it is appearing on every page but just at one wiki, that sounds like either: a userscript (likely), or a browser-extension or some kind of malware (both less likely). Please try blanking your w:User:Masssly/vector.js and w:User:Masssly/common.js and m:User:Masssly/global.js (one by one), to see if that removes it, to help narrow the problem down. (Also, note that you've got some duplication between your vector.js and common.js). Hope that helps. Quiddity (WMF) (talk) 18:10, 3 February 2015 (UTC)Reply