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About this Add-on
When the add-on is installed, Firefox will reject cookies from all websites by default. You can then control cookies using its toolbar buttons.
Websites that you visit often can be whitelisted by clicking the Whitelist button (+). You can choose to accept their cookies permanently or until the end of each browser session.
For websites that you do not visit often, you can turn the Cookie button (C) on. Cookies stored during this time will be removed when you turn the Cookie button off, or close the browser.
Why is my cookie whitelist being deleted?
Please make sure that Firefox is not configured to clear its "Site Preferences". This will remove the cookie whitelist.
Where does CWWB store my cookies/cookie whitelist?
Your cookie and whitelist data is stored by Firefox in your profile folder. Please refer to this article: Firefox Help: Profiles