#Persistent SetBatchLines, -1 Process, Priority,, High Gui +hWndhWnd DllCall( "RegisterShellHookWindow", UInt,hWnd ) MsgNum := DllCall( "RegisterWindowMessage", Str,"SHELLHOOK" ) OnMessage( MsgNum, "ShellMessage" ) Return ShellMessage( wParam,lParam ) { If ( wParam = 4 ) ; HSHELL_WINDOWACTIVATED := 4 { WinGetClass, Class, ahk_id %lParam% If ( class = "MozillaWindowClass" ) { WinSet, Style, -0x80000, ahk_class MozillaWindowClass } } }