GNU Gnuzilla and IceWeasel
"Gnuzilla is the GNU version of the Mozilla suite, and IceWeasel is the GNU version of the Firefox browser.
Its main advantage is an ethical one: it is entirely free software. While the source code from the Mozilla project is free software,
the binaries that they release include additional non-free software. Also, they distribute non-free software as plug-ins.
(IceWeasel does keep the triple licensing used by Firefox to facilitate the reuse of code.)"
So go download Iceweasel .