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Now if you accidentally or intentionally clicked on this option, Firefox will never show any notification message if a pop-up window is blocked on a website. It can be used to disable the notification bar. The “ Options” button in notification bar also contains an option “ Don’t show this message when pop-ups are blocked“. The message bar also contains an “ Options” button which lets you open the blocked pop-up window and whitelist the website so that it can always open pop-up windows. The notification message tells you that “ Firefox prevented this site from opening a pop-up window” as shown in following screenshot: When Mozilla Firefox blocks pop-up windows, it shows a message at the top of the web page in form of a notification bar. How to Block All Unwanted Website Pop-ups in Mozilla Firefox

You can read the full guide at following link: To make it fully functional and perfect, you need to modify a preference present in the hidden secret advanced configuration page i.e. Mozilla Firefox also comes with a built-in pop-up blocking tool which blocks pop-up windows but its not perfect and doesn’t block all kind of pop-ups. This useful feature prevents websites from opening annoying pop-up windows which usually contain advertisements and sometimes malicious malware too. All web browsers come with pop-up blocker feature which automatically blocks unwanted pop-up windows.