"All jobs run recently have lower error rates because our service continues to become more reliable as we fix bugs our users discover. "
This says to me that none of the results can really be trusted because the error count is not just errors in the browser - it's apparently significantly affected by errors in their system, and we don't really know by how much.
Plus it seems kind of anachronistic to come to some conclusion about how the browsers compare having removed FF4 and FF5. It's only of historical interest how FF3.6 compares since anyone that downloads it now is going to get FF6 now anyway.
This says to me that none of the results can really be trusted because the error count is not just errors in the browser - it's apparently significantly affected by errors in their system, and we don't really know by how much.
Plus it seems kind of anachronistic to come to some conclusion about how the browsers compare having removed FF4 and FF5. It's only of historical interest how FF3.6 compares since anyone that downloads it now is going to get FF6 now anyway.