tener('message', handle_message, false)

        window.onerror = function (msg, url, lineNo, columnNo, error) {
          // ignore errors from import map polyfill - these are necessary for
          // it to detect browser support
          if (msg.includes('module specifier “vue”')) {
            // firefox only error, ignore
            return false
          }
          if (msg.includes("Module specifier, 'vue")) {
            // Safari only
            return false
          }
          try {
    