· comprehensive popup controls to keep unwanted advertising off your desktop;
· a tab browsing mode that lets you open several pages in a single window, allowing you to load links in the background without leaving the page you're on;
· integrated search (powered by Google);
· industry leading accessibility with Find As You Type - find links and page text by simply typing;
· simplified privacy controls that let you cover your tracks more effectively;
· a streamlined browser window that lets you see more of the page than any other browser while at the same time being more configurable;
· a large variety of free downloadable extensions and themes that add specific functionality and visual changes to the browser.

Download:
http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/1.5.0.5-candidates/rc5/firefox-1.5.0.5.en-US.win32.installer.exe