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After the most recent update, Norton detected a threat from this extension. I will not be using this anymore.

Это отзыв для предыдущей версии этого дополнения (0.3.0.1-signed). 

The add-on's complete source code is out there and you can see for yourself whether there is anything malicious.

You should report this to Norton instead of complaining it here.

FYI: here's the result from virscan.org.
http://r.virscan.org/report/ca10e3e138fd0552929db6c54f48440e.html