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Firefox claims that it is running

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When Firefox is started for the second time a message appears saying that Firefox is running and needs to be closed. This requires a reboot to clear. Operating systemWindows XP SP3. Firefox 3.6.12 This problem only appeared after updating.

When Firefox is started for the second time a message appears saying that Firefox is running and needs to be closed. This requires a reboot to clear. Operating systemWindows XP SP3. Firefox 3.6.12 This problem only appeared after updating.

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For the possible causes of that error see "Firefox is already running but is not responding" error - How to fix, in your case it appears that Firefox is not shutting down normally.