line 76, calling localStorage.getItem on a key that is not defined returns null. Passing null to JSON.parse() throws an Exception, "Uncaught illegal access", in old versions of V8. A bug was filed, some info here: http://code.google.com/p/android/issues/d

s-static.ak.facebook.comxd_localstoragev2

(function () {
    if (!(window.postMessage && window.localStorage && window.JSON)) return;
    var a = {
        setItems: function (event, i) {
            if (!g({
                write: 1
            }, event.origin)) return false;
            var j = i.length,
                k = [];
            for (var l = 0; l < j; l++) {
                var m = i[l];
                k[l] = d(m.key, m.value, m.expireIn, m.acl);
            }
            return k;
        },
        getItem: function (event, i, j) {
            var k = e(event, i);
            if (j) if (i.substring(0, 9) == 'LoginInfo') h(i, k != null);
            return k;
        }
    };

    function b(event) {
        var i = event.data;
        if (typeof i == 'string') i = JSON.parse(i);
        if (i && a[i.method]) {
            var j = i.params || [];
            j.splice(0, 0, event);
            c(event, i.returnCb, a[i.method].apply(null, j));
        }
    }function c(event, i, j) {
        if (i) event.source.postMessage({
            cb: i,
            data: j
        }, event.origin);
    }function d(i, j, k, l) {
        if (!i) return false;
        var m = {
            v: j,
            a: l
        };
        if (k) m.e = (new Date()).getTime() + k * 1000;
        m = JSON.stringify(m);
        try {
            localStorage[i] = m;
        } catch (n) {
            return false;
        }
        return true;
    }function e(event, i) {
        var j = localStorage.getItem(i);
        if (!j) return null;
        var k = JSON.parse(j);
        if (!k || !g({
            read: 1
        }, event.origin, k.a)) return null;
        var l = k.e && k.e < (new Date()).getTime();
        if (l || (k.a && k.a.readOnce)) localStorage.removeItem(i);
        return l ? null : k.v;
    }function f(i) {
        return (i && i.indexOf('://') != -1) ? i.substr(i.indexOf('://') + 3) : i;
    }function g(i, j, k) {
        var l = f(j),
            m = k ? f(k.domain) : null,
            n = l.match(/\.facebook\.com$/);
        if (i.write && !n) return false;
        if (i.read && !(n || l == m)) return false;
        return true;
    }function h(i, j) {
        var k = {
            app_id: i.split('_')[1],
            cached: j,
            event_type: 'view',
            time: Math.round((new Date()).getTime())
        },
            l = JSON.parse(localStorage.getItem('_log')) || {
                a: {
                    uid: k.user_id,
                    readOnce: true
                },
                v: []
            };
        l.v.push(k);
        localStorage.setItem('_log', JSON.stringify(l));
    }
    addEventListener('message', b, false);
})();