I have a problem with Firefox and Opera windows. Both seem to move or resize or readjust in a way I haven't figured out yet when switching to the tag where either is the only window. I've configured a manageHook to doFullFloat on isFullScreen and doFloat on many Firefox sub-windows/sub-dialogs which seems not transient (addons settings, etc., bookmarks). No manageHook for Opera. Firefox is Linux nightly. Opera is Linux 12.00. When I use a different then Unix style in Opera and make it maximized by pressing the button in the title bar it always unmaximizes anytime I change back to the tag with only Opera in it. To remove borders in fullscreen mode I've applied smartBorders to the layout. layoutHook = smartBorders (avoidStruts $ layoutHook defaultConfig) Chromium doesn't seem to have this problem. Any idea what's going on?