Likely just a staging-config issue, but please double-check. At the top of http://crash-stats.stage.mozilla.com/products/Firefox, I see: "Warning: date_default_timezone_get() [function.date-default-timezone-get]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/Los_Angeles' for 'PDT/-7.0/DST' instead in /data/www/crash-reports-php.mozilla.org/webapp-php/system/core/Kohana.php on line 116" This same error is breaking URLs like http://crash-stats.stage.mozilla.com/topcrasher/byurl/Fennec/
Sorry, I should have cc'd y'all on bug 604678.
Verified duplicate; at least it wasn't something I missed :-)