FadeMind [1] filed a deletion request for thunderbird-firetray-git [2]:
https://aur.archlinux.org/packages/thunderbird-firetray/ is maintain and updated if needed. This git package is not needed anymore.
[1] https://aur.archlinux.org/account/FadeMind/ [2] https://aur.archlinux.org/pkgbase/thunderbird-firetray-git/
Request #2463 has been accepted by Muflone [1].
aur-requests@lists.archlinux.org