The misspelling in the blurb "Crack open any extenstion or web app in a gallery and see what it actually does before installing" doesn't render a lot of trust.
s/extenstion/extension/
s/extenstion/extension/
*fixed typo, thx
I think it's quite rational to suggest that work is of dubious quality if something as important as the tagline or elevator pitch contains errors that should be caught by a proofreading or spell-checker. The author spelled it correctly in the title and elsewhere in the text, so it's a simple error, not a lack of knowledge. It would be impolite to not suggest improvements, because the author could use my help.
A rational response to my comment would be exactly as you have done with drv's comment: "Fixed typo, thanks!"
How can I submit comments like this in the future? I didn't see an easy way to submit feedback to serg472 (the author's name isn't clickable, and there's no email as described in http://www.google.com/support/chrome_webstore/bin/answer.py?...), so I dropped it here in case the parent, who was obviously supportive of the extension, wanted to forward it to someone who could take action.