\documentclass[danish,a4paper,11pt]{scrartcl}
\usepackage{babel}
\usepackage{slantsc}
\usepackage{array}
\usepackage{amsmath}
\setkomafont{subsection}{\usefont{T1}{fvm}{m}{n}}
\setkomafont{section}{\usefont{T1}{fvs}{b}{n}\Large}
\setcounter{secnumdepth}{0}
\pagestyle{empty}
\usepackage[sfdefault]{FiraSans} %% option 'sfdefault' activates Fira Sans as the default text font
\usepackage[T1]{fontenc}
\renewcommand*\oldstylenums[1]{{\firaoldstyle #1}}

\begin{document}
\section*{Fira Sans}
\subsection*{\textbackslash normalfont}
\normalfont
For mange Aar siden levede en Keiser, som holdt saa uhyre meget af
 smukke nye Kl\ae der, at han gav alle sine Penge ud for ret at blive
 pyntet. Han br\o d sig ikke om sine Soldater, br\o d sig ei om Comedie
 eller om at kj\o re i Skoven, uden alene for at vise sine nye Kl\ae
 der. Han havde en Kjole for hver Time paa Dagen, og ligesom man siger
 om en Konge, han er i Raadet, saa sagde man altid her: >>Keiseren er i
 Garderoben!<<~--

\subsection*{\textbackslash itshape}
\normalfont\itshape
For mange Aar siden levede en Keiser, som holdt saa uhyre meget af
 smukke nye Kl\ae der, at han gav alle sine Penge ud for ret at blive
 pyntet. Han br\o d sig ikke om sine Soldater, br\o d sig ei om Comedie
 eller om at kj\o re i Skoven, uden alene for at vise sine nye Kl\ae
 der. Han havde en Kjole for hver Time paa Dagen, og ligesom man siger
 om en Konge, han er i Raadet, saa sagde man altid her: >>Keiseren er i
 Garderoben!<<~--

\subsection*{\textbackslash bfseries}
\normalfont\bfseries
For mange Aar siden levede en Keiser, som holdt saa uhyre meget af
 smukke nye Kl\ae der, at han gav alle sine Penge ud for ret at blive
 pyntet. Han br\o d sig ikke om sine Soldater, br\o d sig ei om Comedie
 eller om at kj\o re i Skoven, uden alene for at vise sine nye Kl\ae
 der. Han havde en Kjole for hver Time paa Dagen, og ligesom man siger
 om en Konge, han er i Raadet, saa sagde man altid her: >>Keiseren er i
 Garderoben!<<~--

\subsection*{\textbackslash bfseries\textbackslash itshape}
\normalfont\bfseries\itshape
For mange Aar siden levede en Keiser, som holdt saa uhyre meget af
 smukke nye Kl\ae der, at han gav alle sine Penge ud for ret at blive
 pyntet. Han br\o d sig ikke om sine Soldater, br\o d sig ei om Comedie
 eller om at kj\o re i Skoven, uden alene for at vise sine nye Kl\ae
 der. Han havde en Kjole for hver Time paa Dagen, og ligesom man siger
 om en Konge, han er i Raadet, saa sagde man altid her: >>Keiseren er i
 Garderoben!<<~--

\newpage
\normalfont
\section*{Font table}
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 \newcount\currchar
 \currchar0
 \def\showchar{\makebox[.09\linewidth]{\strut\char\currchar\hfill\tfont\tiny\the\currchar}
   \global\advance\currchar1}
 
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 \end{tabular}


\end{document}
