click () {
          if (!pathID) { // Not ready yet as haven't received first payload
            return;
          }
          window.postMessage(
            {
              webappfind: {
                type: saveMessage,
                pathID,
                content: svgEditor.svgCanvas.getSvgString()
              }
            }, window.location.origin === 'null'
              // Avoid "null" string error for `file:` protocol (even
              //  though file protocol not currently supported by add-on)
              ? '*'
              : window.location.origin
          );
        }
@param {external:Window} win external Window handler
@param {*} param1 info
@returns {void}