I just upgraded to the latest version of Firefox and the new URL bar is really annoying, the way it remembers every page you’ve visited and pops them up as you type in the address.
Luckily it’s configurable and you can change the way it behaves. Phil lists all the settings here, but the way he did it switches it off completely.
I just changed the setting
browser.urlbar.matchOnlyTyped and now it only shows the URLs that I’ve manually typed in, rather than everything I’ve ever visited.