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3
  • No such file in Firefox 23
    – Laserson
    Commented Sep 3, 2013 at 7:39
  • 1
    @Laserson create the file if it doesn't exist.
    – SlimShaggy
    Commented Oct 17, 2016 at 11:54
  • I had to do 2 more things for this to work. 1) enable toolkit.legacyUserProfileCustomizations.stylesheets on the "about:config" page and 2) add !important to the css value, as in font-size: 14pt !important;.
    – Alex
    Commented Mar 29 at 12:08