I love my firefox with all my add-ons and bookmarks, but sometimes i need to just open a fresh browser, without remembering my tabs or passwords. I have two browsers for this. One is Epiphany and the other is opera.
Epiphany web browser is light, fast, and simple. It does all your basic tasks fast and well. Official browser for the gnome desktop, so it also looks great. Only for linux. I design and edit my blog from epiphany.
sudo apt-get install epiphany-browser
Opera Web Browser is another light, simple browser I like to have on hand. It is available for linux, windows, and mac.
sudo apt-get install opera
Windows/Mac/Other Linux Distribution:
Download from here