Fontconfig file for better firefox fonts on *NIX on websites like Github and Twitter

fonts.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
  <!-- Set preferred serif, sans serif, and monospace fonts. -->
  <alias>
    <family>serif</family>
    <prefer><family>Droid Serif</family></prefer>
  </alias>
  <alias>
    <family>sans-serif</family>
    <prefer><family>Alef</family></prefer>
  </alias>
  <alias>
    <family>sans</family>
    <prefer><family>Alef</family></prefer>
  </alias>
  <alias>
    <family>monospace</family>
    <prefer><family>Droid Sans Mono</family></prefer>
  </alias>
  <!-- Aliases for commonly used MS fonts. -->
  <match>
    <test name="family"><string>Arial</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Alef</string>
    </edit>
  </match>
  <match>
    <test name="family"><string>Helvetica</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Alef</string>
    </edit>
  </match>
  <match>
    <test name="family"><string>Verdana</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Alef</string>
    </edit>
  </match>
  <match>
    <test name="family"><string>Tahoma</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Alef</string>
    </edit>
  </match>
  <match>
    <!-- Insert joke here -->
    <test name="family"><string>Comic Sans MS</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Alef</string>
    </edit>
  </match>
  <match>
    <test name="family"><string>Times New Roman</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Droid Serif</string>
    </edit>
  </match>
  <match>
    <test name="family"><string>Times</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Droid Serif</string>
    </edit>
  </match>
  <match>
    <test name="family"><string>Courier New</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Droid Sans Mono</string>
    </edit>
  </match>
  <match>
    <test name="family"><string>Segoe UI</string></test>
    <edit name="family" mode="assign" binding="strong">
      <string>Alef</string>
    </edit>
  </match>
</fontconfig>