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Editorial Team
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Asked: 2026-05-28T02:53:45+00:00

I try to understand Firefox’s behavior regarding the added prevent this page from creating

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I try to understand Firefox’s behavior regarding the added “prevent this page from creating additional dialogs” on dialog boxes.

Using jquery, if I add the following listeners :

//html
<input class="testInput" />

//javascript
$('.testInput')
.click(function(){ alert('clicked') })
.keyup(function(){ alert('keyup') })
  1. When clicking on the input, the alert box appears normally, until the
    ~13th time.
  2. When hitting a key, on the other hand, the second message box already
    appears with the message “prevent this page from creating additional
    dialogs”. Actually, there seems to be some tiemout, and if I wait
    like 2 seconds between two keystrokes, the message disappears.

From my informal tests, 2. actually applies whenever the alert box is not called from within a onclick callback (e.g : keyup callback, displaying an alert box in answer to an ajax action…)

I am using Firefox 9.0.1 under Ubuntu, as far as I know I haven’t tweaked firefox’s settings regarding these thresholds.
I imagine it happens with any recent version of any browser.

I am using the jQuery library, but I don’t think it is relevant here.

My question is :
What are the exact rules which make this warning appear in a dialog box ?

[Edit]

Using Chromium/Ubuntu (version 17.0.963.26), the threshold seems to be only the delay between two dialog boxes.

You can test this from jsfiddle here (thx Rory McCrossan)

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1 Answer

  1. Editorial Team

    The exact rule(s): A timed interval between the dialog boxes popping up.
    The value used to determine this is set in SUCCESSIVE_DIALOG_TIME_LIMIT

    Check out line 2614 in the link below the snippet: 

    nsGlobalWindow::DialogOpenAttempted()

TimeDuration dialogDuration(TimeStamp::Now() - topWindow->mLastDialogQuitTime);

if (dialogDuration.ToSeconds() < Preferences::GetInt("dom.successive_dialog_time_limit",SUCCESSIVE_DIALOG_TIME_LIMIT)){topWindow->mDialogAbuseCount++;return (topWindow->GetPopupControlState() > openAllowed || topWindow->mDialogAbuseCount > MAX_DIALOG_COUNT);}topWindow->mDialogAbuseCount = 0; return false;}

    Link to source

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