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Firefox crashes

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firefox crashes on startup, even when I try to open in safe mode. I tried uninstalling and re-downloading, but the same problem persisted. The only thing that I noticed was that upon re-downloading, it said that firefox was incompatible with java and I have recently installed a new version.

firefox crashes on startup, even when I try to open in safe mode. I tried uninstalling and re-downloading, but the same problem persisted. The only thing that I noticed was that upon re-downloading, it said that firefox was incompatible with java and I have recently installed a new version.

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Hello e_holmes,
Your crashreport:
https://crash-stats.mozilla.com/report/index/bp-cc1d6e7d-8f7d-49a1-997a-120e22111106
Firefox 7.0.1 Crash Report [@ _purecall | nsXPTCStubBase::QueryInterface(nsID const&, void**) ]
This is caused by Trusteer Rapport. Try to disable it and see if that stops the crashing.
You can stop Rapport using Start Menu > Programs > Trusteer Rapport > Stop Rapport
You can ask their helpdesk when an updated version of their product will be made available or, if you don't need this software, uninstall it.
http://www.trusteer.com/support/en/report-problem
According to the user in question 892517 Trusteer is aware of the problem and working on a fix.
See also Bug 699776 - crash in nsXPTCStubBase::QueryInterface involving RapportTanzan7.dll in the stack.