[Bug 92134] Symbolic threaded stack trace

[Brian Murray]

** Attachment added: "ThreadStacktrace.txt (retraced)"
   http://librarian.launchpad.net/6836763/%3Cfdopen%3E

** Tags added: mt-needsummary

** Tags removed: mt-needretrace

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[feisty] Firefox Crashed x86_64
https://launchpad.net/bugs/92134