The EU regulations require that any website using cookies must get user's permission before installing them. Imagine how irritating that becomes when you surf anonymously or if you delete cookies automatically every time you close the browser.
You can report any website which still warns you about cookies: make a right click and choose 'Report a cookie warning' from the menu.
Other browsers are supported too. Check http://www.kiboke-studio.hr/i-dont-care-about-cookies/ for info, support or personal contribution.