I would suggest linking directly to the extension [0] instead of the search page also I've never heard of Codemarks before and the extension doesn't have any details on what it actually does, you might want to add that in.

[0] https://chrome.google.com/webstore/detail/codemarks/mhajcmhk...

A fellow Starter League alumni did this and I am super impressed. Here is the main site too. http://codemarks.com/codemarks