How to change the font size for the mozilla firefox interface?

[Lian Liming]

Hi all,
  I am using mozilla firefox under KDE, and find that the font size on 
toolbar and menu  is too small to watch clearly. I tried to enlarge the 
font size in firefox toolbar Edit->Preferences->General->Fonts & Colors. 
But the changes only apply to the content of the browser. The font size 
on toolbar and menu remain no changed.
  Then i tried to enlarge the font size in KDE->Control 
Center->Appearance & Themes->Fonts->Tooblar and Menu. The changes apply 
to all program on the desktop except firefox.
   So i wonder if there are any other way to change the font size for 
mozilla firefox toolbar and menu?
   Thank you for suggestions.

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