Jar makes sure the only cookies kept on your Mac are from sites in your history, bookmarks or top sites.
Open the Jar disk image, double click “Jar.prefPane” and follow the prompts.
In System Preferences, click Jar, click “Stop”, then click “Show All” at the top of the window. Control-click the Jar icon and select “Remove” from the menu.
To configure Jar, select “System Preferences…” from under the Apple menu and click the Jar icon. Click the “Start” button to enable Jar. Click “Stop” to disable it.
When enabled, Jar will keep your Mac free of any cookies from sites which aren’t in your browser history, bookmarks or top sites. (BTW, Don’t be surprised if Jar removes a few thousand cookies the first time it runs!)
Click the gear icon and select “Advanced…” to access Jar’s advanced panel. In this panel you can optionally configure Jar to remove cookies supplied by Google Analytics and include Adobe Flash cookies when cleaning. Also, you can view the cookies currently on your Mac and some information about cookies recently removed (within the last three hours).