1 error, 1 suggestion Rated 5 out of 5 stars
James, sorry, I couldn't find any contact info for you, so I will post my comments here.
Thanks for making an extension like this, it is great to see people developing tools for others.
I have found one minor bug, and have on suggestion:
Bug: In March, it seems the transition in days is incorrect from Sunday to Monday in week two (i.e. using the %j command from March 9 to 10 2008 says day "69" for both)
I think the extension is great, but would love to see it take a little less priority. If it could popup on hover, and not prevent changing tabs, that would be great.