MarsSeed [1] filed a deletion request for spice-xpi [2]: Upstream is EOL since 2015. [a] Website is down (no server). [b] Package build is currently broken due to minor issue relating to git submodule handling. But it is useless to fix and keep: no working and available Firefox (-based) browsers support third party XPCOM (xulrunner) binary plugins like this one. Mozilla has dropped support for those in Firefox v57, released in 2017. [c] Installing this package has no effect whatsoever on the current Firefox. [a]: https://cgit.freedesktop.org/spice/spice-xpi [b]: https://spice-space.com/ [c]: https://developer.mozilla.org/en- US/docs/Mozilla/Firefox/Releases/57#changes_for_add- on_and_mozilla_developers [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/spice-xpi/