Xfdesktop makes .desktop files non executable when it shouldn't
When you drag n drop an URL from Firefox to the desktop the execution bit will be set automatically which is fine. But when you then right click the file, select "Edit Launcher", change the name (or not) and click save then the execution bit will be removed. When you then want to start the .desktop file the corresponding warning dialogue appears: "non confident launcher - [execute anyway] [mark as executable] [abbort]".