polyzen [1] filed a deletion request for firefox-extension-ublock [2]:
The project appears to be dead.
Shoddy practices by current project maintainer(Chris). See top of https://github.com/gorhill/uBlock/blob/master/README.md
[1] https://aur.archlinux.org/account/polyzen/ [2] https://aur.archlinux.org/pkgbase/firefox-extension-ublock/
Request #5787 has been accepted by xyproto [1].
aur-requests@lists.archlinux.org