Opting out permanently: Browser Instructions
Unfortunately, the plugin is available only for Internet Explorer, Firefox & Google Chrome. You can always opt out using the Ads Settings, but without a special browser plugin, your opt-out setting will go away when you delete your browser's cookies (you would need to set it again manually).
Don't want to opt out?
Visit Ads Settings to edit the preferences that are associated with this cookie.
Open source
The Google advertising cookie opt-out plugin is available as open source on our project code site.