Why, when I open Firefox 4, do I keep having Firefox 3 pop up continually and having the error message "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." ?

Every time that I try to use Firefox 4, Firefox 3 pops up on the Dock and tries to start up. I get the error message "A copy of Firefox is already open. Only one copy of Firefox can be open at a time." I click OK and the message goes away. Then it happens again. And again. It doesn't stop until I quit Firefox 4. I've tried creating a new profile (and deleting my old one) and deleting the .parentlock and the profile.ini file, but nothing works. Help me please!

See:
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding

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