Disable Resume & App Window Restore Completely in Mac OS X Lion & Mountain Lion
If manually deleting specific apps saved Resume states is too tedious for you, you can always choose to just disable the Resume and App Restore feature completely in Mac OS X 10.7.
- Launch System Preferences and click on the “General” icon
- At the bottom of the “Number of recent items” list, uncheck the checkbox next to “Restore windows when quitting and re-opening apps”
This is a sweeping change that impacts all applications and the Finder itself, meaning all apps will no longer save their previous state, including when you reboot your Mac.
Considering that Resumes is genuinely useful, plus it’s one of the snazzier new features that is heavily boasted about in OS X Lion, this should not be considered a recommended adjustment for everyone.