MarsSeed [1] filed a deletion request for firefox-theme-ft-deepdark [2]: EOL, broken package from 2017; the addon and its sources have been deleted from addons.mozilla.org server.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/firefox-theme-ft-deepdark/
