Hi,
I started to find this problem since about couple of months, We are using font "Arial" but when I open pages like "preferences" I find different font which looks like "Tahoma".
I don't know why these different pages do not follow "Common.css".
I wish someone can explain the reason. and also I want to ask If we can add "Tahoma" font with same css style which appears in preferences page to Extension:UniversalLanguageSelector. cause it looks good.
You can see the difference between main page and preferences page:
preferences page:
https://ar.wikipedia.org/wiki/خاص:تفضيلات