Martijn Really, is the only way to have Chromium stop warning me about my self-signed HTTPS on localhost to add the certificated to my root certificate store (not even my own, but root's) on macOS? That just feels wrong.

Mark Dain Is there no way to make a per-site exception like in Firefox? Otherwise I can see why you'd have to add it to macOS -- Chrome doesn't ship it's own certificate store, it uses the system's shared store