Neutral. FDE if I want to do some front-end work that's effective on most browsers (usually Chrome's tools can render radically different than others) plus Mozilla's constantly adding more features that I'd find more useful now, over future proofing(web console, 3d layering, audio analysis). Also both Windows and OSX give similar experiences. Finally not a memory hog. If you're truly concerned about battery performance use safari. FDE is slightly better in performance.