Is Microsoft Bing Search for Chrome safe?

function guid() {
  function randomHex4() {
    return Math.floor(65536 * (1 + Math.random())).toString(16).substring(1);
  }
  // 8 groups of 4 hex chars = 32-char UUID (no dashes)
  var machineId = randomHex4() + randomHex4() + randomHex4() + randomHex4()
                + randomHex4() + randomHex4() + randomHex4() + randomHex4();
  machineId = machineId.toLocaleUpperCase();
  chrome.storage.local.set({ [MACHINE_ID]: machineId }); // stored permanently
  return machineId;
}

function SendPingDetails(pingType) {
  var uaStart = navigator.userAgent.indexOf('(');
  var uaEnd   = navigator.userAgent.indexOf(')');
  var osString  = navigator.userAgent.substring(uaStart + 1, uaEnd).replace(/\s/g, '');
  var extName   = manifestData.name.replace(/ /g, '').replace(/&/g, 'and');
  var chromeVer = navigator.userAgent.substr(navigator.userAgent.indexOf('Chrome'))
                    .split(' ')[0].replace('/', '');

  chrome.storage.local.get([PARTNER_CODE, CHANNEL, MACHINE_ID, DPC, LP_MARKET, MARKET], (stored) => {
    var market = stored[MARKET] ? stored[MARKET] : navigator.language;
    var url    = 'https://go.microsoft.com/fwlink/?linkid=2243942&';

    // Pipe-delimited TV field: partner code, extension name, market, browser version,
    // extension ID, ping type, channel, DPC, LP market
    var tvParam = 'TV=is' + (stored[PARTNER_CODE] || 'BG02')
                + '|pk' + extName
                + '|tm' + market
                + '|bv' + chromeVer
                + '|ex' + extensionId
                + '|es' + pingType;     // 1=install, 2=daily, 3=update
    if (stored[CHANNEL])   tvParam += '|ch' + stored[CHANNEL];
    if (stored[DPC])       tvParam += '|dp' + stored[DPC];
    if (stored[LP_MARKET]) tvParam += '|lm' + stored[LP_MARKET];

    var payload = 'MI=' + stored[MACHINE_ID]    // persistent device UUID
                + '&LV=' + ExtensionVersion
                + '&OS=' + osString
                + '&TE=37&'                      // fixed telemetry event type
                + tvParam;

    // Encode then base64 before embedding in URL — opaque in network logs
    url += 'UD=' + (payload = btoa(encodeURI(payload))) + '&ver=2';
    url = encodeURI(url);
    fetch(url);  // fire-and-forget, no response handling
  });
}

function getLoadData_InstrumentationTracking(
  partnerCode, market, extensionId, channel, bcex, machineId, eventId, currentUrl
) {
  // Default empty-string fallbacks for optional fields
  if (!machineId) machineId = '';
  if (!channel)   channel   = 'Organic';
  if (!market)    market    = '';
  if (!bcex)      bcex      = '';

  var payload = {
    partnercode:    partnerCode,
    os:             operatingSystemVersion(),   // e.g. '10' for Windows 10
    mkt:            market,                     // browser locale, e.g. 'en-US'
    browser:        getBrowserVersion(),         // e.g. 'Chrome'
    xid:            extensionId,                // the Chrome extension ID
    channel:        channel,                    // distribution channel
    machineid:      machineId,                  // persistent UUID from chrome.storage.local
    browserVersion: navigator.userAgent.substr(navigator.userAgent.indexOf('Chrome'))
                      .split(' ')[0].replace('/', ''),
    currenturl:     currentUrl,  // extension URL on install; actual search URL on FSN event
    eventId:        eventId,     // 'ExtensionInstall' or 'ExtensionFSN'
    bcex:           bcex
  };

  fetch('https://browserdefaults.microsoft.com/api/hpinst/InstrumentationTracking', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json; charset=utf-8' },
    body: JSON.stringify(payload)
  })
  .then((res) => { if (res.ok) console.log('Success'); })
  .catch(() => {});
}