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All modern browsers allow you to change your cookie settings. These settings will typically be found in the ‘options’ or ‘preferences’ menu of your browser. In order to understand these settings, the following links may be helpful, otherwise, you should use the ‘Help’ option in your browser for more details.
The table available at http://faq.netvibes.com/knowledgebase/articles/1858438-cookies-we-use provides you with the list of cookies Netvibes uses, their retention period and their purpose.