Kindle E-mail Address stored?

Will the Kindle E-mail Address be stored in a cookie?
As I delete all cookies on exit, any idea to prevent loss (FF 21)

Hi there,

We use HTML5’s local storage to store the email address. Some browsers will treat this data the same way they treat cookie data - so perhaps if your browser is set to clear cookies on exit, it will clear this too. You might want to see if there’s a way to add an exception for to see if this information is preserved.