Of course if you download Opera, you never need worry about  popups again.

Open-source browser Mozilla's latest version features many small to medium functional improvements, adding additional capabilities in a number of areas. Past versions combined speed, standards compatibility, and the most robust feature set of any browser. Features such as tabbed browsing along with managers for pop-ups, cookies, forms, images, passwords, and downloads prove indispensable once you start using them. Beyond the browser, Mozilla includes a readily accessible suite of Internet applications such as mail and newsgroup clients, an HTML editor, and IRC chat. The Mozilla team focused on spam control, a very popular topic, with Mozilla's mail client, adding very useful junk mail controls. Past users will notice improvements in the pop-up and image managers, as well as the ability to immediately launch downloaded EXE files. Users of the HTML editor can now dynamically resize tables and images. The array of features and flexibility for Mozilla make it a browser we can unreservedly recommend.