Tenfourbird is unofficial build of Mozilla Thunderbird for PowerPC based Mac OS X.
Tenfourbird uses changesets of TenFourFox.
Latest version is 38.9.0.
This is Lightning for PowerPC Mac OS X. (Unofficial build)
Lightning is already distributed with Tenfourbird. These xpi files are distributed for re-installation.
You can check integrity of files by RIPEMD160 or SHA512 hashes. It also signed by OpenPGP key of t_mrc-ct[at]users.sourceforge.jp. The public key could get from here or OpenPGP Keysever.
source and patches are same as Tenfourbird 38.1.0.