chromium extension http://code.google.com/chrome/extensions/index.html
	packaging
		http://code.google.com/chrome/extensions/packaging.html
		http://code.google.com/chrome/extensions/hosting.html
		http://code.google.com/chrome/extensions/crx.html
	use a simple script to create crx rather than chromium-browser
	is the script src=simplyread in background.html necessary?
	handle signing extension properly
epiphany extension http://projects.gnome.org/epiphany/extensions
make tests, which process sample html files and check the output