Disable "Prevent this page from creating additional dialogs" for certain websites as a user

This behaviour can be controlled by setting the config parameter dom.successive_dialog_time_limit. This integer value represents a time window in seconds since the last pop-up. If a website generates a new pop-up within that window, Firefox will instead trigger the "Prevent..." dialog.

To set this value:

1. Copy this string to your clipboard: dom.successive_dialog_time_limit
2. In FireFox Address bar Enter: about:config and press enter.
3. Accept the warning dialog.
4. In the preferences area right-click.
5. Select New-> Integer
6. Paste the string you copied previous and click OK
7. Enter the integer 0 in the next dialog box and click OK.¹
8. Close the about:config page.

^{1: for most cases, setting this value to 1 or 2 seconds will be sufficient to allow pop-up heavy websites to work without interruption while still stopping malicious infinite pop-up JavaScript code.}