How do I upgrade to firefox 9?

Trying to upgrade to firefox 9 for Mac OSX. I come to the point where I am instructed to drag the firefox icon to the applications, and I get a message that it can't be done because firefox is in use. What do I do now?

If you updating by dragging a new version of Firefox to your Applications folder you have to make sure that Firefox is not running.
#Click on Firefox in the dock
#Go to the Firefox menu and select "Quit Firefox"
#Then drag the new version of Firefox to your applications folder

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