I believe just the appearance. I think that was my problem with the change. FF2, the URLs never moved, so instead of using bookmarks, I used the location bar to hit my favorite sites.
https://addons.mozilla.org/en-US/firefox/addon/6227
Quote:
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Note that the underlying autocomplete algorithm is the Firefox 3 algorithm, not the Firefox 2 algorithm. oldbar only affects the presentation of the results.
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