From MozillaZine Knowledge Base
The Web Applications 1.0 specification defines a mechanism allowing web pages to store information with a web browser (similar to cookies) called “client-side session and persistent storage.” Although use of session storage is subject to a user’s cookie preferences, this preference allows it to be disabled entirely.
Possible values and their effects
Enable client-side session and persistent storage for web pages (Default)
Disable SCS entirely
First checked in
Has an effect in