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.)

var taskId = task.id;
  var refSnapshotDir = path.join(refsDir, os.platform(), browser, taskId);
  var testSnapshotDir = path.join(
    testResultDir,
    os.platform(),
    browser,
    taskId
  );
  var pageResults = results[0];
  var taskType = task.type;
  var numEqNoSnapshot = 0;