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My browser has been closed all night and in the morning I get an error saying that Firefox is still running and I need to shut it donw. Why is this?

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I close the browser and it does not matter how much time elapses it still says that Firefox is running. I am told to close Firefox before I can open another session. I hit ctrl+alt+del to pull the task manager and it does not show any Firefox applications.

I close the browser and it does not matter how much time elapses it still says that Firefox is running. I am told to close Firefox before I can open another session. I hit ctrl+alt+del to pull the task manager and it does not show any Firefox applications.

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That's strange try updating to Firefox 5.1 you can download it over at http://www.mozilla.com.

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There is no 5.1 - Firefox 5.0.1 was a special version to fix some Mac OSX issues which Apple created with the 10.5 and 10.6 updates and the release of 10.7 Lion last week. Windows and Linux versions don't need those patches and weren't updated. The global download server array can't handle different version numbers for different OS platforms, so the full download versions had to be version number "bumped" for Windows & Linux to match the new Mac version number.


As far as your support question, you probably had a "hung" Firefox Process - look in the Processes tab in the Task Manager.
https://support.mozilla.com/en-US/kb/Firefox%20hangs
See hang-at-exit