FabioLolix [1] filed a deletion request for webkit2gtk-mse [2]: Orphan, last update on 2018-08-12, the only pkgbuild that depends on this never worked and the option to indicated that MSE is enabled (--webkitgtk-supports-mse) no longer exist
[1] https://aur.archlinux.org/account/FabioLolix/ [2] https://aur.archlinux.org/pkgbase/webkit2gtk-mse/
