The latest version of Mozilla's popular open-source browser enjoyed one of the most successful launches in software history, with a record-setting 8.2 million downloads the first day it was available. With the ability to drastically expand the browser's functions using plug-in extensions and Greasemonkey scripts, many of Firefox 3's built-in features are overlooked. Here are eight handy things you can do with Firefox, ranging from tiny tweaks to hugely powerful capabilities, all with nary an extension to install.