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Firefox crashes at startup

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I cannot open Firefox because it crashes at startup even in Safe Mode.

I cannot open Firefox because it crashes at startup even in Safe Mode.

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Your crashreport:
https://crash-stats.mozilla.com/report/index/bp-02d00abb-8cb5-4d6b-b8e0-0bca22111103
Firefox 7.0.1 Crash Report [@ _purecall | nsXPTCStubBase::QueryInterface(nsID const&, void**) ]
This may be related to Trusteer Rapport. Try to disable it and see if that stops the crashing. For more help you can ask their helpdesk.
http://www.trusteer.com/support/en/report-problem