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FF 6.0 does not terminates itself, "plugin-container.exe" keeps running which does not allow termination of process

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After up-graduation to FF 6.0, FF fails to terminate when closed via X button or through Exit options in Menu. It was found that plugin-container.exe does not terminate causing failure to terminate firefox.exe. plugin-container.exe runs as a sub-process to firefox.exe

After up-graduation to FF 6.0, FF fails to terminate when closed via X button or through Exit options in Menu. It was found that ''plugin-container.exe'' does not terminate causing failure to terminate ''firefox.exe''. ''plugin-container.exe'' runs as a sub-process to ''firefox.exe''