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Firefox will not close properly at the end of a session.

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Clicking the "X" close button or selecting "close window" from the system tray icon causes the window to close, but when I try to start a new session I get a window saying "Firefox is already running but not responding." I have to use the Task Manager to "end process" the program before I can start a new session. I reported this last week as an intermittent problem, but it has become constant, as in every time. This happened occasionally (once a month or so) in prior releases, but since the 5.0 release it has quickly gotten significantly worse, until now the only way I can close the program successfully is through the task manager.

Clicking the "X" close button or selecting "close window" from the system tray icon causes the window to close, but when I try to start a new session I get a window saying "Firefox is already running but not responding." I have to use the Task Manager to "end process" the program before I can start a new session. I reported this last week as an intermittent problem, but it has become constant, as in every time. This happened occasionally (once a month or so) in prior releases, but since the 5.0 release it has quickly gotten significantly worse, until now the only way I can close the program successfully is through the task manager.

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