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Adjust cookie permissions
1. Click the wrench icon tools menu on the browser toolbar. Mac users: If you don't see the wrench icon, go to the menu bar at the top of your screen and click Chrome.
2. Select Options (Preferences on Mac and Linux; Settings on Chrome OS).
3. Click the Under the Hood tab.
4. Click Content settings in the "Privacy" section.
5. Click the Cookies tab in the Content Settings dialog that appears:
Delete cookies
Click Show cookies and other site data.
* To delete all cookies, click Remove all.
* To delete a specific cookie, select the site that issued the cookie, then the cookie, and click Remove.
There are also instructions on Google's page about managing Google Chrome's cookies.You could follow along there,if you would like to block the doubleclick.net cookie:
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Make exceptions for cookies from specific websites or domains
To control how cookies should be handled for a few specific sites or domains, click Exceptions. To add a rule in the Cookie Exceptions dialog that appears, follow these steps:
1. Click Add.
2. In the dialog that appears, enter the domain name for which you want to create an exception in the “Pattern” field. To create exceptions for an entire domain, insert [*.] before the domain name (e.g. [*.]google.com). You can also specify an IP address, an IPv6 address, or a non-http URL.
3. Select an option from the “Action” menu to determine whether the site can set cookies. If you select Session only, its cookies are deleted every time you close your browser.
4. If you’re making an exception in incognito mode, you can select the “Only apply to this incognito session” checkbox to make the exception override normal exceptions. The exception is removed once you close the last incognito window.
5. Click OK.
You can also edit or remove exceptions by selecting the domain exception from the list and using the buttons on the bottom of the dialog.
Please let me know how it goes. :)