Firefox:A Browser is arguably the most used Application while connected to the Internet. It actually acts as a channel between your computer and the Internet world. With multiple vulnerabilities found in Internet Explorer in the recent past, users all over the world are switching over to a more secure browser. Firefox is one such browser, which is not only more secure but also rich in features. For example, be it with the popup blocker or the much touted tab browsing. The full version of Firebox browser can be downloaded free from http://www.getfirefox.com
I have tried Firefox and I liked it too but have become more of a Opera fan. Still a much better alternative to other browsers ( including Opera! ;) ). Its fast, small, nifty and definitely has good interface. Have a go for it you might just start liking it.