javascript - block multiple instances of firefox app -

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i have built firefox 22 application in javascript/html5 , block user opening multiple instances of (whether in separate tab or separate browser).

currently works extent when try open instance of it, redirects about:blank, brings original instance of application focus (switches tab or window), , displays alert (on original instance). done checking displaystate variable i've set in localstorage.

the problem i've run while alert up, user can open many instances of application he/she wants.

is there better way using (a displaystate check in) localstorage this? or there way keep alert timing-out application?

alert blocks script execution in firefox (this not e.g. opera), hardly can change this. therefore should use different.

nonetheless may set localstorage key on application startup , unset on shutdown (window.onunload). user can stuck, though, if browser crashes. may try sessionstorage, automatically cleaned when browser closed.


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