There is a big difference in between the firefox 3 location bar and firefox 2 location bar both in terms of the looks and functionality provided. Just in case if you don’t like the location bar or address bar of firefox 3 and revert it to as there in firefox 2 here is how you can do it.
There is a cool addon called Old Location Bar which makes firefox 3 location bar look and act like firefox 2 location bar
Some other key features provided by old location bar addon are