Opera and sometimes FF. For extremly rare cases, IE. Also a large variety of non-browsing http clients, starting with wget and ending with various specialized clients. Lynx and w3m on limited ocassions.
For personal reasons, I do not browse the web from my computer. (I also have not net connection much of the time.) To look at page I send mail to a demon which runs wget and mails the page back to me. It is very efficient use of my time, but it is slow in real time.