With all the buzz about Microsoft buying Yahoo we should take a look at some of the offerings from Yahoo.
I am a big fan of the Yahoo! Toolbar
The toolbar installer will ask if you want to install for Firefox and it will also to make Yahoo the default search engine and to make yahoo.com the home page.
Agree to the terms. You will be asked to help Yahoo with tracking, I usually answer yes. It really does help make for a better search experience when you supply some of your behavior and per the privacy policy your identity is not used. On the machine I just installed it I didn’t have to put in my username and password or even login.