Error when starting Firefox 3.6. "Javascript Application error. Invalid username/password combination. If you continue to get this error, try entering your email address as your username." Any suggestions on what to look for to resolve this?

When starting Mozilla Firefox 3.6, I get an error window which opens up additionally overtop my browser windows stating:
"Javascript Application"
followed with :
"Invalid username/password combination. If you continue to get this error, try entering your email address as your username."
Obviously it is happening with one of my email addresses/usernames & password combinations of which I know the username for (which I choose not to post here) and I'm not sure where to begin looking for a resolution to this problem.

I was able to resolve this by disabling (under Tools - Add-ons) Yahoo! Mail Notifier
Hope this helps some of you also!

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