You can try the new settings section of Firefox

Firefox 15 nightly build now gives you an insight into what's new in the settings menu.

This is not the case before presented the first stage of a large wrinkle stitching, but only a minor cosmetology, as the reworking only affected the settings section. The browser is no longer configured in a pop-up window, but in a new tab. This layout is similar to the Google Chrome solution, but unfortunately at the moment we’re searching the search box in vain - hopefully even later, the programmers will go over that. No new window will appear when entering the menu items, but in this case we can already make good use of the navigation buttons, which allow us to easily return to the starting point. 

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If you want to see the new layout of the settings live, be the first to download Firefox 15 preliminary issue. After installation, change the value of the browser.preferences.inContent setting in the about: config section from false to true. After a reboot, the new layout greets us back. 

Source: geek.com