If you whitelisted a website but no longer want to allow ads there, click the AdBlock button in the browser toolbar and select Resume blocking ads.
- Click the AdBlock button in the browser toolbar and select Options
- On the CUSTOMIZE tab next to "Manually edit your filters," click Edit.
- Delete the filter rules that contain the name of the site you whitelisted.
- Click Save.
- Reload the page where you want to block ads.