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copied!<p>You can kick around the Firefox source if you like. Note that different browsers will have different rules.</p> <p>The relevant code for Firefox is in <a href="http://mxr.mozilla.org/mozilla-central/source/dom/base/nsGlobalWindow.cpp" rel="nofollow"><code>nsGlobalWindow.cpp</code></a> and <a href="http://mxr.mozilla.org/mozilla-central/source/dom/base/nsGlobalWindow.h" rel="nofollow"><code>nsGlobalWindow.h</code></a> (the links below are to line numbers, and so will slowly rot as the source changes). It appears to be controlled by the constants <a href="http://mxr.mozilla.org/mozilla-central/source/dom/base/nsGlobalWindow.h#116" rel="nofollow"><code>MAX_DIALOG_COUNT</code></a> (10) in <code>nsGlobalWindow.h</code> and <a href="http://mxr.mozilla.org/mozilla-central/source/dom/base/nsGlobalWindow.h#112" rel="nofollow"><code>SUCCESSIVE_DIALOG_TIME_LIMIT</code></a> (3, units are seconds). <code>nsGlobalWindow.cpp</code> keeps a count (<code>mDialogAbuseCount</code>). Apparently, the <a href="http://mxr.mozilla.org/mozilla-central/source/dom/base/nsGlobalWindow.cpp#2611" rel="nofollow"><code>dialogDuration</code></a> function either increments or clears <code>mDialogAbuseCount</code> depending on whether the dialog has been open longer than the SUCCESSIVE_DIALOG_TIME_LIMIT. The <a href="http://mxr.mozilla.org/mozilla-central/source/dom/base/nsGlobalWindow.cpp#2628" rel="nofollow"><code>AreDialogsBlocked</code></a> function uses the <code>mDialogAbuseCount</code> (in part) to decide whether they're blocked.</p> <p>So in short: If you're repeatedly opening pop-ups and then closing them within three seconds, after 10 or so you'll trigger something.</p>

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