Rated 3 out of 5 stars

Don't really need this, simply change the settings in about:config.
Twitter uses indexedDB(local storage), so don't disable it if you want to use twitter.
Would be helpful to explain what each setting is and they're used for. Otherwise, users don't know what they're doing to their browser.

cheers.

This review is for a previous version of the add-on (2.0).