[sha666sum]

Although this comment was already debunked, I'll add Arch's Firefox PKGBUILD here [1].

And to save you a click, they compile it from a source tarball.

[1] https://git.archlinux.org/svntogit/packages.git/tree/trunk/P...

[JetSpiegel]

They even need the Google API key...

https://git.archlinux.org/svntogit/packages.git/tree/trunk/P...