The Navigator pref pane has 3 buttons for setting start page values that make it easily grow wider than the Pref window allows with larger fonts, other themes (esp. some OS themes with Classic), or localizations. One possibility to ease that problem is shortening the labels on that buttons, as I've done for the German L10n now. A patch to do that in en-US is in attachment 162718 [details] [diff] [review]

(Filter "spam" on 'prefs-nobody-20080612'.)