Search for a reliable ad-blocking add-on, such as Adblock Plus: A program like DNSUnblocker is an example of those kinds of program. You need to look and choose those programs and uninstall them from Control panel. These are the unnecessary programs which start showing you unnecessary popup windows after getting installed itself in your computer without letting you know. Many times you download anything from any websites and you end up with downloading some unwanted programs in the background. So that, you can access all websites without getting those popup windows on your screen. Follow these two steps and click on ‘Exceptions’ and remove all website data from there. Sometimes you might be still getting popup. It will block all the annoying pop-up windows on your Firefox browser. You need to check that box and tick there. Choose ‘Options’ and you will see a small window with option ‘Block Popup Window’. You need to click on setting icon on Top right corner of Firefox window. Mozilla Firefox provides you an inbuilt facility to block all these annoying popup. Make sure you have turned on the Pop-Up Blocking Feature: Well, there are different ways to block Popup. Usually, it frustrates users when it comes again and again even after enabling the popup blocker in settings. Some pop-ups may appear on the top some may come underneath and some may come in the middle of the page. They are of different size and usually don’t cover the whole screen. Stop Pop-Ups in Firefox – Popup boxes or pop-up windows are windows that appear on your screen without your permission or when you are doing something on any website.

How to stop pop ups on mac n firefox