How is a non-hacker end user supposed to run a tarball? How are they supposed to know what the installer is? Why make it so hard?

Why can't Firefox do what Skype and Miro do (below)?

* If the user string contains Windows, provide an MSI. In these OSes, if you click on a MSI package, it installs.

* If the user string contains OS X, provide a install image. In these OSes, if you click on an install image, it installs.

* If the user string contains Debian or Ubuntu, provide a dpkg. In these OSes, if you click on an dpkg, it installs.

* If the user string contains Fedora, RHEL or SuSE, provide a rpm. In these OSes, if you click on a rpm package, it installs.

* Anything else gets a menu with all the above options.