On my recent apps list (Android 4.4.x), I can swipe any application off the list. Does that not work for you? If you have having problems with your Home button calling up Firefox search on a Samsung Galaxy S5 that you updated to Android 4.4.4, check out this thread: http://forums.androidcentral.com/samsung-galaxy-s5/490111-home-button-my-s5-google-now.html (many pages of unhappy customers and various fixes suggested)