Cleartechinfo.org presents a how to video on downloading and installing Firefox v3.5. First you would open your Firefox browser, go to the help tab. Under the health tab, you would click Check for Updates. A screen announcing a Software Update should pop up. When that screen pops up, you can click on the button "Get the new version." After it is downloaded, double-click the set-up file and follow the instructions on the screen to complete the installation.