Openbox by default attempts to start applications that have appropriate desktop files in /etc/xdg/autostart. It does this by executing xdg-autostart if it is present, and if not then openbox-xdg-autostart. xdg-autostart is in package obsession which is a recommended package for openbox. openbox-xdg-autostart is in package openbox itself, but it fails unless package python3-xdg is installed. The failure is relatively silent unless openbox-xdg-autostart is run separately on the command line. python3-xdg should probably be a suggested package, or perhaps more strongly recommended, or perhaps even an either/or with obsession since one of them is required for xdg autostart files to work. This isn't exactly the end of the world since many xdg autostart applications won't start for Openbox anyway. The openbox-session manpage also doesn't mention that desktop files from /etc/xdg/autostart will be run, so perhaps not many people will be surprised when they don't
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