freswa [1] filed a request to merge thunderbird-nightly [2] into thunderbird-nightly-bin [3]:
This is actually a prebuild binary package. [1] https://aur.archlinux.org/account/freswa/ [2] https://aur.archlinux.org/pkgbase/thunderbird-nightly/ [3] https://aur.archlinux.org/pkgbase/thunderbird-nightly-bin/