3

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 doctype (though I think this makes no difference).

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4
  • 1
    Your code works fine for me. You should include the value of "e" in your alert, of course.
    – Pointy
    Commented Oct 1, 2010 at 14:15
  • So it's some strange setting in my version of Firefox? I suppose that's alright, then. I'll try adding e.
    – TRiG
    Commented Oct 1, 2010 at 14:20
  • e is [Exception... "Security error" code: "1000" nsresult: "0x805303e8 (NS_ERROR_DOM_SECURITY_ERR)" location: "http://[domain name elided]/public/javascripts/switch_style.js Line: 18"]
    – TRiG
    Commented Oct 1, 2010 at 14:22
  • A bit of googling on the error number fixed it. In about:config I had dom.storage.enabled set to false. I don't recall doing that. It may be something to do with NoScript (though javascript was enabled).
    – TRiG
    Commented Oct 1, 2010 at 14:27

2 Answers 2

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6

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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0

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.

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