bugs to be resolved:
	(bannerblindPrefs.js).restoreDefaults() closes window
	uninstall button
	list check boxes aren't disabled on load if bannerBlind is disabled
	checked list check boxes aren't greyed out if disabled
	newly added list check box isn't greyed out if enable is not checked
		all three above seems to be due to bugs with the checkbox Widget
		(checked and disable don't seem to mix well)
	English-only messages during installation
bugs fixed:
	l10n support