Looking at the last day's worth of crashes with 0x0 in the signature: http://crash-stats.mozilla.com/query/query?product=Firefox&version=Firefox%3A3.5.3&date=&range_value=1&range_unit=days&query_search=signature&query_type=contains&query=0x0&do_query=1 There are still a set of crashes that come out with just 0x0 as the crashing stack. Maybe we need to repeat the minidump gathering experiment to figure out what's going on with these crashes.

thunderbird also http://crash-stats.mozilla.com/query/query?product=Thunderbird&version=ALL%3AALL&date=&range_value=1&range_unit=days&query_search=signature&query_type=contains&query=0x0&do_query=1

> There are still a set of crashes that come out with just 0x0 as the crashing > stack. Maybe we need to repeat the minidump gathering experiment to figure > out what's going on with these crashes. not insignificant number these days for firefox. But insignificant for Thunderbird. 1 week: - Fx https://crash-stats.mozilla.com/report/list?signature=%400x0&product=Firefox&query_type=contains&range_unit=weeks&process_type=any&version=Firefox%3A26.0a1&version=Firefox%3A25.0a2&version=Firefox%3A24.0b2&version=Firefox%3A23.0&version=Firefox%3A25.0a1&version=Firefox%3A24.0b3&version=Firefox%3A24.0b1&version=Firefox%3A24.0a2&version=Firefox%3A23.0.1&version=Firefox%3A23.0b10&version=Firefox%3A23.0b9&version=Firefox%3A23.0b8&version=Firefox%3A23.0b7&version=Firefox%3A23.0b6&version=Firefox%3A23.0b5&version=Firefox%3A23.0b4&version=Firefox%3A23.0b3&version=Firefox%3A23.0b2&version=Firefox%3A23.0b1&version=Firefox%3A22.0&hang_type=any&date=2013-08-17+14%3A00%3A00&range_value=1 - Tb https://crash-stats.mozilla.com/report/list?product=Thunderbird&version=Thunderbird:17.0.8esr&version=Thunderbird:17.0.8&version=Thunderbird:17.0.7esr&version=Thunderbird:17.0.7&version=Thunderbird:26.0a1&version=Thunderbird:25.0a2&version=Thunderbird:25.0a1&version=Thunderbird:24.0b1&version=Thunderbird:24.0a2&version=Thunderbird:23.0b1&version=Thunderbird:17.0.6esr&query_search=signature&query_type=contains&reason_type=contains&date=2013-08-17&range_value=7&range_unit=days&hang_type=any&process_type=any&signature=%400x0

Not much we can do about this anymore, those crashes are long gone.