png output of screen selection

Hello! I don't know if this is the proper place for this comment. It
is really directed to browser developers, although svg users would
benefit most.
Is it possible to add a tool to Firefox that would allow selection of
an arbitrary quadrangle and subsequently store the bitmap - or much
better: a png file - of the selected area on the Clipboard? This
feature exists in Adobe Reader for pdf displays.
Such a tool would be extremely useful for handling SVG. In that way an
SVG image (or part of it) can be easily pasted into programs like Word
or Powerpoint or its OpenOffice equivalents. We can of course wait
until such programs accept SVG code, but that may never happen.
Imaging how immensely more useful programs with SVG output would
become, e.g. for educational purposes, when students are required to
generate a report with graphic results pasted in. I think such a
feature would really boost the impact of SVG!
Herman www.hjcb.nl