Secure connection failed message when trying to use add on

When I click tool and go to Add ons I get the message above. I am trying to add on a calendar from lightning..

The website may try to fallback to TLS 1.0 in a way that is no longer allowed in current releases or may be using a deprecated cipher suite.
You can open the <b>about:config</b> page via the location/address bar and use its search bar to locate this pref:
*security.tls.insecure_fallback_hosts
You can double-click the line to modify the pref and add the full domain (www.planet.snb.ca) to the value of this pref.
If there are already websites (domains) in this list then add a comma and the new domain (no spaces).
You should only see domains separated by a comma in the value column.
If this helps then you can contact this website and ask them to look into this.
*https://developer.mozilla.org/en-US/Firefox/Releases/36/Site_Compatibility#Security
*https://developer.mozilla.org/en-US/Firefox/Releases/37/Site_Compatibility#Security

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