This makes LibreWolf look at both the Mozilla (eg. /usr/lib/mozilla/native-messaging-hosts) as well as LibreWolf (/usr/lib/librewolf/native-messaging-hosts) native manifest directories. I believe this is the best solution to this, as it will not break anything that has already adjusted to us using our own native messaging dir. And we also don't need to set up separate symliks for each distribution, which would be the alternative proposed in the issue.
The patch is mostly ready, but I still need to test it. (削除) I may also still need to iron out something with ~/.mozilla vs ~/.mozilla/firefox. (削除ここまで)
Closes librewolf/issues#2308