You receive HTTP 401 Unauthorized response when you try to launch a browser with your freemium account.
If you recently registered for a freemium account, it generally takes a few minutes your new API key to propagate in the system. Please give it a try after a few minutes again.
We constantly monitor the usage of freemium accounts, and unfortunately we sometimes encounter abuses on the freemium accounts with fake emails. Under such circumstances we suspend certain freemium accounts. If you think there is mistake, please contact us.
Please contact us if you are still having problems with your freemium account.