Yes, the style inspector is vertical for exactly the reason you cite. We're also working on a better solution so that it doesn't cause issues with responsive de

Yes, the style inspector is vertical for exactly the reason you cite. We're also working on a better solution so that it doesn't cause issues with responsive designs. Firebug is still actively maintained and continues to have new releases and improvements. Firebug 1.10 (currently in alpha), for example, is now restartless and has less impact on page performance.