The Firefox for Android GitHub releases aren’t being updated anymore, and is versions behind the Play Store now.
FDroid Fennec isn’t fully the same app, and FDroid has it’s own set of delays.
Is there a location where the latest version can be pulled/tracked with Obtainium?
https://archive.mozilla.org/pub/fenix/releases/127.0/android/
Is the latest release. As for how to use it in obtainium, I don’t know sorry, as I don’t use it.