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You can't. It's a browser feature there to prevent sites from showing hundreds of alerts to prevent you from leaving. You can, however, look into modal popups like jQuery UI Dialog. These are javascript alert boxes that show a custom dialog.
Many Google Maps users have encountered a pop-up message that says 'Prevent this page from creating additional dialogues' when they try to use some features. This thread explains what this message means, why it appears, and how to deal with it. You can also find answers from Google Maps experts and other users who have faced the same issue.
Aug 14, 2014 · If a website generates a new pop-up within that window, Firefox will instead trigger the "Prevent..." dialog. To set this value: Copy this string to your clipboard: dom.successive_dialog_time_limit; In FireFox Address bar Enter: about:config and press enter. Accept the warning dialog. In the preferences area right-click. Select New-> Integer
Jul 14, 2018 · Checking the 'prevent this page from creating additional dialogs' box stops executing javascript on the next 'alert' statement "Type Error: ToolbarControl.getSettingByType is not a function box keeps appearing!
Dec 21, 2018 · The issue I have is Firefox will ask me (in a dialog) if I want to "prevent this website from creating additional dialogs". I understand the reasoning behind this, but I don't want it. I would prefer that the dialogs behave in the same way they do in other browsers. Can I disable this feature either at the browser
Nov 3, 2014 · I am using the current version of Firefox and when using a particular website (Microsoft CRM Online) I get frequent popup dialogs (which is expected functionality). The issue I have is Firefox will ask me (in a dialog) if I want to "prevent this website from creating additional dialogs".
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Nov 25, 2016 · [help] How to permanently prevent a page from creating additional dialogs (specifically reddit)? If you write a comment on a thread but don't hit 'Save' to submit it, and then you go to close the tab, a handy little dialog will pop-up telling you that you have unsaved work and are you sure you wanna leave the page?
