Pop-up Blocking
Firefox also includes integrated customizable pop-up blocking. Firefox was given this feature early in beta development, and it was a major comparative selling point of the browser until Internet Explorer gained the capability in the Windows XP SP2 release of August 25, 2004. Firefox's pop-up blocking can be turned off entirely to allow pop-ups from all sites. Firefox's pop-up blocking can be inconvenient at times — it prevents JavaScript-based links opening a new window while a page is loading unless the site is added to a "safe list" found in the options menu.
In many cases it is possible to view the pop-up's URL by clicking the dialog that appears when one is blocked. This makes it easier to decide if the pop-up should be displayed.
Read more about this topic: Features Of Firefox
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