"fi" is wrong in iceweasel

[Javier Barroso]

Hello,

In my iceweasel installation some letters doesn't appear fine.

At least "fi", "ffi" and "fe" are combination which iceweasel doesn't
show me fine.

It is like the closed bug:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=420717

Please see this two screenshot attached
1 : http://lists.alioth.debian.org/pipermail/pkg-mozilla-maintainers/2014-January/thread.html
2: bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=iceweasel-dejavu-bug-test.html;att=1;bug=420717

Thank you
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