As a Wikipedia reader, I want to read Wikipedia in the same font size everywhere. (For me personally, this includes private windows; as anonymous visitors get the “standard” font size since T362148, this means I want to change my font size preference from “small” to “standard” when logged in too.) But I don’t want to have to change the font size in each individual Wikipedia. Global preferences exist to solve this general problem for several years now; however, because the font size is a separate menu and not shown in the preferences, it’s currently not easy to set it globally (as far as I can tell).

Note that, technically, the font size is a regular preference (vector-font-size), and can be set via the options (locally) or globalpreferences (globally) APIs; as far as I can tell, this works just fine. This task is just about improving the user interface so I don’t have to use the API sandbox to set the global preference :)