LocalStorage Firefox 3.6

According to everything I've read, Firefox 3.5+ supports localStorage. And yet I'm seeing the alert (failing) in Firefox 3.6. Do I have some strange settings in my Firefox? Any ideas?

function supports_html5_storage() {
    try {
        return 'localStorage' in window && window['localStorage'] !== null;
    } catch (e) {
        alert('failing');
        return false;
    }
}

Note: The page has an HTML5 开发者_运维技巧doctype (though I think this makes no difference).

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Even though Firefox supports localStorage, it can be turned off. Check that it is turned on.

Go to about:config and check that dom.storage.enabled is set to true.

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I just ran into the bug described at http://meyerweb.com/eric/thoughts/2012/04/25/firefox-failing-localstorage/: Firefox disallows local storage if you have your cookie options set to "Ask every time". Strange but true, at least in FF12 that I was using at the time. Workaround is to set your cookies to keep for session or until they expire.