I've created an ebuild for trezord, the "bridge" that connects Firefox (and other browsers that aren't Chrome/Chromium) to a Trezor hardware wallet. It's in my overlay: https://gitlab.com/salfter/portage It pulls from Git because it depends on submodules that aren't included in the tarballs GitHub produces for releases.
https://github.com/trezor/trezord now redirects to https://github.com/trezor-graveyard/trezord. Most importantly, this repository is marked as obsolete: > DO NOT USE! This version has been obsoleted by a new generation of TREZOR Bridge available from here: trezor/trezord-go The new repository is available at https://github.com/trezor/trezord-go.
That older version was removed from my overlay a while ago. It had long ago been superseded by the v2 (Go) fork.
net-p2p/trezord-go is packages in ::guru
Not much point keeping this open, especially with the current version in the guru repo.