\documentclass[12pt]{article}
\usepackage{mdwtab,footnote}
\usepackage{tabularx}%
\makesavenoteenv{tabularx}
\makeatletter
\renewcommand\@makefntext[1]{%
  \noindent\makebox[2ex][l]{\@thefnmark\quad}#1}
\makeatother

\begin{document}
\noindent
\begin{minipage}{\hsize}
  \renewcommand{\footnoterule}{}
  \begin{tabularx}{\hsize}{crlllX}
    A & B & C & D & E & F   \\
    A & B & C & D\footnote{first footnote} & E & F\\
    A & B & C & D & E\footnote{second footnote}& F\\
    A & B & C & D & E & F\footnote{third footnote}\\
  \end{tabularx}
\end{minipage}

\end{document}