My Firefox web browser is configured to request pages in European Portuguese, namely by sending the HTTP Header: Accept-Language: pt,en;q=0.7,en-US;q=0.3 However, whenever accessing Mozilla web sites, the web server always choose to redirect to the page with the content in Brazilian Portuguese as can be confirmed looking also to the response HTTP header: localization: /pt-BR/ There are two errors, first the browser do not allow to add the Accept-Language as pt-PT so the server would make the correct judgement of the localization as a workaround since now W3C decided that pt stands for Portuguese from Portugal and all the other Portuguese speaking countries will have to add the capital letters of the respective country, meaning a Brazilian user should and currently can add the language Brazilian Portuguese as preferred language. Please kindly correct both the browser and the web site so the pages in European Portuguese can be seen at all.