I have used portable Firefox, loaded onto a USB thumbdrive for several years. This way, I can save all my passwords (for sites like Forest River Forums, and a lot of business websites) into Firefox, and have them and all my other settings no matter what computer I am using. Works real well, when going back and forth between a home and work computer.
By using the browser on a thumbdrive, it doesn't leave any traces on the host computer.
I also use the free portable open office this way too.
You can get them, along with all kind of other free programs (including Chrome and Opera) here:
PortableApps.com - Portable software for USB, portable and cloud drives
They have packages already bundled with the most common apps, so you can just download the whole package and have what you want.
Once you get what programs you want downloaded onto a USB drive, and start using it, you'll probably like it as well as I do.
All of the free add-ons for Firefox, is another big plus (like a WYSIWYG editor add-on)