How to block pop up ads with a Firefox browser add on extension First, open Firefox. Then, click the orange button labeled Firefox in the upper left hand corner of the browser window, then click ...

How to Remove Unwanted Ads From Firefox. Unwanted ads like pop-ups or pop-unders are windows or advertisements that appear on a Web page without permission.

Firefox is one of the best browsers for blocking ads and crappy web trackers, and you can make it even better using “nuke-’em-all” browser extensions like uBlock Origin.

Pop-ups are mostly a thing of the past, but nowadays we have to deal with overlays. Fortunately, there's an extension for that—or two.