Fixing fonts that raise a &DFLT table doesn't satisfy the spec. LangSysCount is not zero& error in Firefox
Did you ever got this infamous error message in Firefox debug console (with CSS error messages enabled) ?
downloadable font: Layout: DFLT table doesn't satisfy the spec. for script tag DFLT (font-family: "MyBeautifulFont" style:normal weight:normal stretch:normal src index:1) source: http://W.X.Y.Z/fonts/myfont …