Safari does not provide any option to auto-delete cookies on quit like other browsers do. So the idea is do delete the cookies on shut down of Max OS X using a shell script: *1. Create an empty Cookie file* a) Open Safarib) Go to Preferences –> Security - > Show Cookies c) Delete all Cookiesd) Quit Safari without loading any website in betweene) Open Finder f) Go to „/Users/XXXXXX/Library/Cookies/“ (Replace XXXXX with your username) g) Copy „Cookies.plist“ to „CleanedCookies.plist“ in this folder Done! Now you should see two files in the folder „~/Library/Cookies/“: „Cookies.plist“ and „CleanedCookies.plist“! *2. Create autostart shell script* a) Open Terminalb) Type: „cd /Library/StartupItems/“c) Type: „sudo mkdir /DeleteCookies“ - > Enter your passwordd) Type: „sudo pico“ (a shell text editor will open)e) Paste this inside: {quote} #!/bin/sh . /etc/rc.common #StartService () #{ #} StopService (){cp -f /Users/XXXXX/Library/Cookies/CleanedCookies.plist /Users/XXXXX/Library/Cookies/Cookies.plist }RestartService (){StopService}RunService "$1" {quote} f) Change „XXXXX“ to your username (at two places!)g) Press „Ctrl - X“ (it asks if it should save the document)h) Press „Y“ (it asks for a file name)i) Type „DeleteCookies“j) Don’t close the Terminal! We will need it again. *3. Create StartupParameters* a) In Terminal type: „sudo pico“b) Paste this inside (with { and }): {quote}{Description = "DeleteCookies";Provides = ("Deletes Safari cookies on shut down");Uses = ("Disks");} {quote} c) Press „Ctrl - X“ (it asks if it should save the document)d) Press „Y“ (it asks for a file name)e) Type „StartupParameters.plist“f) Now you may close the Terminal Now you should see two files in the folder „/Library/StartupItems/DeleteCookies/“: „DeleteCookies“ and „StartupParameters.plist“. Done! *4. Restart the system* a) Restart your computerb) After reboot it will tell you that StartupItems do not have the right permissionsc) Click on „Correct Permissions“ (2 times for the two created files)d) Restart your computer again. Now your Safari-Cookies should be deleted automatically each time when you shut down your PC.