Currently I'm using Chrome. Firefox has become way too much of a memory hog, even on a fresh install with no plugins. They have been saying for years it was a result of poorly designed plugins causing memory leaks, yet Chrome has pretty much all of the same plugins and doesn't crash and hog memory like Firefox. I was using a variation of Chrome called SRWare Iron, but I had to switch back to Chrome when I was having issues with it not rendering some pages properly. Also, it didn't have automatic updates, which got to be a bother with keeping it up to date.