I got the following error when accessing
https://pt.wikipedia.org/wiki/Wikip%C3%A9dia:P%C3%A1ginas_para_eliminar/Lista
today (both logged in and logged out), using Firefox:
{ "errorMessage": "Error: module already implemented: user.options", "url": "https://pt.wikipedia.org/w/load.php?debug=false&lang=pt&modules=jquery%2Cmediawiki&only=scripts&skin=vector&version=%2Ba17lhsh", "lineNumber": 169, "columnNumber": 733, "errorObject": {} }
Reloading the page didn't fix the problem, and it also happens in debug mode.