Pop-ups are one of the biggest culprits, and they’re much more annoying on mobile, as opposed to the desktop. Browsing on the Web on your phone or computer can become a fraught experience if you visit sites that throw a lot of pop-ups at you. It’s particularly bad on the mobile where it is hard to dismiss these. However, this is slowly becoming less of an issue, as most browsers now allow you to prevent pop-ups altogether. You can follow the below steps to block pop-ups with Firefox.
How to Block Pop-Ups in Firefox on iPhone/ iPad
Tap the hamburger menu button at the bottom.
Swipe left, and then choose Settings.
Turn on the toggle for Block Pop-up Windows to block pop-ups, or turn it off to allow pop-ups.