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Gopher for Chrome and Amplified Labs other Gopher Tools require that some third party cookies be enabled in order to launch the sidebar.  If you want to permit only the individual cookie without enabling all third party cookies, you can do the following.

Click at the top of the omni-bar where it says "Secure" and choosing "Cookies in use"

Click on the "Blocked" tab at the top of the popup and highlight the cookie with the value shown below:

Once the cookie has been allowed, reload the page or relaunch the sidebar.