This will happen occasionally on both Firefox and Safari when cookies don’t match. Sometimes, WordPress will store an auth cookie and, for some reason, won’t read data back out of it. This leaves you in a weird place of being semi-logged-in.
If you flush your cookies for the site, it should rectify the problem. Either delete the cookies manually via Firebug or tell FireFox to delete all cookies (either globally or just for the site), then log back in.
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