How do I change the size of the location bar in firefox 18?

I want to make the location bar much smaller and the search bar much bigger (I still want them to use the entire width of the toolbar). I read elsewhere in the forums that you can change the size of the bar by going to CUSTOMIZE and once the cursor changes to a re-size cursor, simply click and drag. However, that only worked for me with previous versions of Firefox. Since I've had to upgrade, the cursor remains a hand and never changes to the re-size arrow.

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