Removing popdown URL's in Firefox

Regarding Firefox 3.6 (latest ver). When I type in a URL in the URL
bar, FF is retaining every website I ever used. That popdown under
the URL bar is where I'm seeing them. When I type in a URL, that
popdown of suggested websites underneath is bringing up every website,
some going back over a year or more. For example, I type "www.y" and
I see a flood of youtube URLs I've been to. If I type "www.g" I'll
get a bunch of google entries and so on. This got sucked from version
2 and into 3.6 when I recently upgraded. I did the "clear private
data", clear cache, cookies, etc.... What file is storing this info?
I want it removed. I'm assuming this file is stored in the
windows/application data/mozilla/firefox folder, because I did remove
FF 2 after I found ver 3 was working well, and these things are still
there. At the least, I'd like to clear the list, because there are
some sites that I want removed for the sake of others that may use my
computer. Better yet, I'd rather just eliminate those popdowns
completely. I have no need for them at all, and it's distracting and
annoying, and I've never used it yet. I just want to type in my URL
and be done with it.

How can I either stop the popdowns entirely, or at least clear the
list?

Thanks

 

Try Tools >Options > Privacy panel, under "Location Bar"
When using the location bar, suggest: [<drop-down list>]

<http://support.mozilla.com/en-US/kb/Location bar autocomplete#w_controlling-behavior>