Nice tool, nice example of using Firefox as a platform, and nice example of how small ideas are proliferating: Firedoodle …
is a Firefox Add-On that allows you to mark up any page as if it was projected onto a white board. You can download the plugin at Firedoodle.com and if you register an account, any highlights you created can be saved (and later shared).
(kudos to Julie for this)
Steve Sanderson 
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