Background package produces background on every page, despite firstpage=false

Question

In the following example, pagenumber is printed on every page. What am I doing wrong?

\documentclass[10pt]{article}
\usepackage{background}
\backgroundsetup{angle=0,  
  scale=1, 
  color=blue, 
  firstpage=false,
  position=current page.south west, 
  hshift=44pt,
  vshift=460pt,
  contents={Page \thepage}
}
\usepackage{lipsum}

\pagestyle{empty}
%%%%%%%%%%%%
\begin{document}

   \lipsum[1-15]

\end{document}

Answer 1

From the documentation about the key firstpage (top of page 3 in the manual):

This boolean option allows the user to specify, setting the value true, that the background material must be displayed only in the first page of the document. The default value is false.

So this is the expected behavior. You have to conditionally insert the material, instead:

\documentclass[10pt]{article}
\usepackage{background}
\backgroundsetup{angle=0,
  scale=1,
  color=blue,
  position=current page.south west,
  hshift=44pt,
  vshift=460pt,
  contents={\ifnum\value{page}=1 \else Page \thepage\fi}
}
\usepackage{lipsum}

\pagestyle{empty}
%%%%%%%%%%%%
\begin{document}

   \lipsum[1-15]

\end{document}

Answer 2

The documentation of the 'background' package provides a way easier solution to this:

You can use the command \NoBgThispage on the particular page, where you don't want the background image to appear.

    \documentclass[10pt]{article}
    \usepackage{background}
    \backgroundsetup{angle=0,
      scale=1,
      color=blue,
      position=current page.south west,
      hshift=44pt,
      vshift=460pt,
      contents={\thepage}
    }
    \usepackage{lipsum}

    \pagestyle{empty}
    %%%%%%%%%%%%
    \begin{document}

      \NoBgThispage
      \lipsum[1-15]

    \end{document}