sipak [1] filed a deletion request for firefox-kde-opensuse-rpm [2]: Sorry!! Please disregard previous delete request. I was dropping this for the bin, but these other packages have several problems. This package has the advantage of not requiring trusting a single individual or private repos.
[1] https://aur.archlinux.org/account/sipak/ [2] https://aur.archlinux.org/pkgbase/firefox-kde-opensuse-rpm/