Followed steps in article: http://mzl.la/1BAQKUb MANY SITES STILL REPORT COOKIES DISABLED, SOME SITES WON'T WORK AT ALL!
Good example is logging in to a MailChimp account.
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You may have a corrupt cookies.sqlite file.
Type about:support in the address bar and press enter.
Under the page logo on the left side you will see Application Basics. Under this find Profile Folder. To it’s right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.
Locate the cookies.sqlite file. Then rename or delete it. Restart Firefox.
Removed cookies.sqlite as directed above... exactly the same message when connecting to MailChimp.
Do you have security software that could possibly block the cookies?
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test.
You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History > Show All History" or "View > Sidebar > History") or via the about:permissions page.
Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks, cookies, passwords, cache, history, and exceptions, so be cautious and if you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.
You can't recover from this 'forget' unless you have a backup of the involved files.
It doesn't have any lasting effect, so if you revisit such a 'forgotten' website then data from that website will be saved once again.