#7: Change numExpectedRedirects from 3 to 2 to avoid displaying alerts.

- The actual number of loadstart events varies between 3 and 4.
- If the number of loadstart events is 3, and the numExpectedRedirects
is also 3, then the expression “else if (numExpectedRedirects > 0 &&
counts['loadstart'] < (numExpectedRedirects+1))” would be true and the
alert message “Unexpected: should have got at least 4 loadstart events,
but got 3” would be displayed.