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I load multiple tabs and firefox crashes right away, or I open a new tab and it crashes.

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I open six or seven pages that require authentication, FF will often crash while attempting to load the tabs, or crash later when opening a new tab.

I open six or seven pages that require authentication, FF will often crash while attempting to load the tabs, or crash later when opening a new tab.

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Go to the address about:crashes, and tell us your latest crash IDs.

A brief look at your data already posted, one thing I would recommend is to update your Flash plugin. See Flash Plugin - Keep it up to date and troubleshoot problems