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Operating Systems OS X (Apple) Are you sure you want to quit Safari? Post 303032395 by Don Cragun on Saturday 16th of March 2019 12:36:52 AM
Old 03-16-2019
I haven't found a way to disable it, but I haven't been looking.

I sometimes get that message when macOS is trying to close Safari when I try shutting down a system, but not always. I just tried closing Safari and it quit immediately with no complaints. I reopened it again and asked it to restore all windows from my previous session and it did so with no problems.

If it helps, I think that message appears when I have a pop-up notice that I haven't dismissed, but there may be other conditions as well.
 
SMPROXY(1)						      General Commands Manual							SMPROXY(1)

NAME
smproxy - Session Manager Proxy SYNOPSIS
smproxy [-clientId id] [-restore saveFile] OPTIONS
-clientId id Specifies the session ID used by smproxy in the previous session. -restore saveFile Specifies the file used by smproxy to save state in the previous session. DESCRIPTION
smproxy allows X applications that do not support X11R6 session management to participate in an X11R6 session. In order for smproxy to act as a proxy for an X application, one of the following must be true: - The application maps a top level window containing the WM_CLIENT_LEADER property. This property provides a pointer to the client leader window which contains the WM_CLASS, WM_NAME, WM_COMMAND, and WM_CLIENT_MACHINE properties. or ... - The application maps a top level window which does not contain the WM_CLIENT_LEADER property. However, this top level window contains the WM_CLASS, WM_NAME, WM_COMMAND, and WM_CLIENT_MACHINE properties. An application that support the WM_SAVE_YOURSELF protocol will receive a WM_SAVE_YOURSELF client message each time the session manager issues a checkpoint or shutdown. This allows the application to save state. If an application does not support the WM_SAVE_YOURSELF pro- tocol, then the proxy will provide enough information to the session manager to restart the application (using WM_COMMAND), but no state will be restored. SEE ALSO
xsm(1) AUTHOR
Ralph Mor, X Consortium X Version 11 smproxy 1.0.2 SMPROXY(1)
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