How do I delete INDIVIDUAL website addresses from Firefox 3.5.3 address bar history?

I highlighted the URL (either in the History sidebar or in the address bar drop-down) and pressed Shift+Delete but it's not permanent.
I click on the down-arrow of my address history bar, and the "deleted" url is back again.

I already know how to disable it with the "about:config" option
(browser.urlbar.maxRichResults, modify=0). However, I want to keep the dropdown bar. I want to delete INDIVIDUAL url website addresses.

Thanks
 
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