I have subscribed to xmonad maillist. But i have never received any email from it ! I have to resend the same subject about Firefox `save as` dialog doesnot appear ? Hi, *Henrique G. Abreu *thanks for your quick answer ! I have tried commenting`[ className =? "Firefox" --> doF W.swapDown] but still doesnot work! BTW, After using composeOne instead of composeAll, recompiling report: %xmonad --recompile Error detected while loading xmonad configuration file: /home/sw2wolf/.xmonad/xmonad.hs xmonad.hs:48:28: Couldn't match expected type `Maybe (Data.Monoid.Endo WindowSet)' against inferred type `Data.Monoid.Endo WindowSet' Expected type: MaybeManageHook Inferred type: ManageHook In the expression: className =? c --> doFloat In the expression: [className =? c --> doFloat | c <- myCFloats] * *Sincerely!