I am trying to use use userChrome.css to modify the font-sizes of some UI elements in Thunderbird. When I double click an event on my calendar sidepane, the popup window's font size is very small, and seems unaffected by the global font size for UI elements, determined by Menu > View > Font Size. Similarly, the font size in the calendar window (Ctrl+3) in the top right (CW 38 Day Week Multiweek Month) is also too small for my screen. Could someone please tell me the CSS identifier for these UI elements?