How do I delete cookies from my computer?

check the internet option in your browser menu, file, edit check and look for internet options delete cookies

I call this the Jesus cookie...'cause it resurrects itself after you think it's been killed. "a JavaScript API...evercookie does this by storing cookie data with as many local storage mechanisms as it can find. Apart from standard browser cookies there are Flash cookies, a number of local storage repositories provided by HTML 5, even in the RGB values of PNG graphics forced into the cache. On Kamkar's TODO list are Silverlight Isolated Storage and the window.name field. The really evil part comes when evercookie finds that the user has removed any of the types of cookies in question. It then recreates them using each mechanism available." [13 in all] http://blogs.pcmag.com/securitywatch/2010/09/new_evercookie_claims_its_toug.php A good collection of effective add-on's (Official Mozilla) is here: https://addons.mozilla.org/collections/dunbar-pappy/dunbarpappy/ AdBlock Plus (with 'subscription' added) & "Better Privacy" also helps defray rubbish. ►► At minimum, get the #1 item for malware prevention: "NoScript", which constrains automagically fetching & deployment of potentially tainted assets. [Bookmark and refer to this page for how it works, and how to use it...very straight forward; http://noscript.net/features#contentblocking 1st party cookies are from sites you 'asked' Firefox to fetch, and they are not so bad, and you'll keep getting them when you use the Internet. You may as well resolve to keep them, and be done with it. It's those 3rd party cookies (and assets) that are evil. If ultra-privacy is your goal, use a "Live Linux set-up, and you'll not have anything each time you start up.

The best solution for this is CC Cleaner