Hello sirinath, Would you please read this article : https://www.askvg.com/tip-how-to-block-all-unwanted-website-pop-ups-in-mozilla-firefox/ And also : https://support.mozilla.org/en-US/kb/pop-blocker-settings-exceptions-troubleshooting Maybe you'd like to check the values of some preferences on the "about:config" page : Type in the address bar '''about:config''' and press Enter (promise to be careful, if asked) Type in the search bar : '''popups''' You'll see a number of preferences appear. If you have to change anything, then close and restart Firefox, in order for the change to take effect. 'Hope this helps ......