Interestingly, they are there: https://github.com/mozilla/gecko-dev/blob/771bc161e016e2bd1f7982a88d387916fdf350dd/netwerk/base/nsIOService.cpp#L117 https://git

Interestingly, they are there: https://github.com/mozilla/gecko-dev/blob/771bc161e016e2bd1f7982a88d387916fdf350dd/netwerk/base/nsIOService.cpp#L117 https://github.com/mozilla/gecko-dev/blob/771bc161e016e2bd1f... (Confirmed on a recent-ish Firefox browser) They look to have been there for at least 5 years, dunno when they were added before that.