FreeSoftwareTools.net

Firefox is a popular open source web browser. It is fast and secure.

Firefox is fully customized since supports plugins.
The plugins are not limited to themes but help the web developer too.
Now days implementing a web page is synonym to firefox. Firebug, HTML validator, tamper data is a small list of them.
Specially for developers firefox is the only way to go.
For general proposes you can only consider firefox and opera as a valid solution for surfing.