Other, better options
It may be that you concerns around cookies relate to so called “spyware”. Rather than switching off cookies in your browser you may find that anti-spyware software achieves the same objective by automatically deleting cookies considered to be invasive. There are many free programs that will do this perfectly well.
For a more sophisticated approach, there are a number of products such as ‘Ghostery’ that enable you to select which websites you wish to block from installing cookies. While not endorsing the product, our developers use it to remove many of the advertising and marketing tools that we don’t want before they get to them. One by-product is that many websites work a lot quicker as well.