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Firefox locks up / plugin container error appears -- what to do?

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Firefox locks up. "Plugin Container has to stop" error appears. Tried reloading FF (3.6), no change

Firefox locks up. "Plugin Container has to stop" error appears. Tried reloading FF (3.6), no change

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Make sure that your firewall doesn't block the plugin-container process.

See http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins