What browser?

On a Win 7 system, I'm already using Chrome and Firefox, but I need a third browser.  Don't ask, just accept that it streamlines my work flow - I just had this argument with my son, who assumes everyone should organize their work the way he does.
So - Iron has been a dismal failure, and I have an ingrained dislike of MS Explorer.  Anyone using anything else that they love?  Thanks for all suggestions.