As can be seen from the first round of testing in PR #15864, trying to update Puppeteer beyond version `19.0.0` completely breaks testing in Firefox. Curiously it does work locally when the `--noChrome` flag is being used, so it seems to be an issue with running tests in both Chrome *and* Firefox in parallel.

We need to fix this, likely by making some adjustments to our test-suite, such that we don't get "stuck" on an older version of Puppeteer without being able to update. (A temporary work-around could also be to disable testing in Chrome.)

return function (browserName) {
    const queryParameters =
      `?browser=${encodeURIComponent(browserName)}` +
      `&manifestFile=${encodeURIComponent("/test/" + options.manifestFile)}` +
      `&testFilter=${JSON.stringify(options.testfilter)}` +
      `&xfaOnly=${options.xfaOnly}` +
      `&delay=${options.statsDelay}` +
      `&masterMode=${options.masterMode}`;
    return startUrl + queryParameters;
  };
}
function startUnitTest(testUrl, name) {