The EU regulations require that every website must get user's permission before installing cookies. Imagine how irritating that becomes when you surf anonymously or if you delete cookies automatically every time you close the browser.

This browser extension removes annoying cookie warnings from almost all websites!

You can report any website which still warns you about cookies: make a right click and choose 'Report a cookie warning' from the menu.

I don't care about cookies for Firefox

Firefox instructions FREE

Install the add-on from the official Firefox website.

I don't care about cookies for Firefox

Pale Moon instructions FREE

Install the add-on from the Pale Moon addon repository.

I don't care about cookies for Chrome

Google Chrome instructions FREE

Install the extension from the Chrome Web Store.

I don't care about cookies for Opera

Opera instructions FREE

Install the extension from the official Opera website.

I don't care about cookies for Adblock Plus

Adblock Plus instructions FREE

Safari, Internet Explorer, Chrome for Android and others can get the filter list and use it with favorite ad blocker extension. Add to Adblock Plus or download the list.
Be aware that it can not be as good as a real browser extension due to technical limitations of ad blocking software but it will cover 99% of cookie warnings.