My pick: Firefox/Mozilla.
Others features being equal, the feature I like & use in Firefox is right click, 'Block Images from _site_', and block all ads from the site I visit regularly. I have also installed 'Flashblock' & disabled all flash content by default. So I am freed of flash ads also.
PS: I must add 'wand' feature in Opera is pretty good too & I don't see it in any other browser.