With regards to rust issues the official thunderbird package switched to rustup with this in the PKGBUILD:
# packed_simd no longer builds with 1.78.0
rustup toolchain update --profile minimal 1.77.2
rustup default 1.77.2
https://gitlab.archlinux.org/archlinux/packaging/packages/thunderbird/-/blob/115.11.1-1/PKGBUILD#L87
Pinned Comments
lsf commented on 2025-01-01 21:28 (UTC)
Please refrain from abusing the flagging of a package as out of date for build issues. This is not what it is supposed to be used for.
I automatically get notified of comments to this package. I do not need to be notified of whatever build problems occur (whether they are an individual's problems or the actual package's problems) twice, and not via flagging it out of date.
Issues with this package can also be reported at https://codeberg.org/librewolf/issues/issues (as it is also maintained there, at https://codeberg.org/librewolf/arch, too).