Internet Explorer Windows

1. In your browser's menu bar go to Tools --> Internet Options --> General --> Browsing History --> Delete...
2. From this window delete the Temporary Internet Files, Cookies and History.
3. Close this window, then select OK before exiting the browser.

Firefox Windows

1. In your browser's menu bar, go to Tools --> Options --> Privacy
2. From the Privacy window select the Settings... tab found in the Private Data subsection
3. In the Private Data subsection window choose Download History and Cache and select OK.
4. To clear NPR only cookies, go to Tools --> Options --> Privacy
5. Select Close and then OK again before closing the window and exiting the browser.

Firefox Mac OSX

1. In the Mac OSX menu bar, go to Firefox --> Preferences --> Privacy
2. From the Private Data subsection select the Settings... tab and choose Cache, Browsing History and Download History only and select OK
3. Close the Preferences window and Exit the browser

Safari Mac OSX

1. In the Mac OSX menu bar, go to Safari --> Empty Cache