You sent me down a rabbit hole, but onion sites don’t need a CA

https://onionservices.torproject.org/research/proposals/usability/certificates/

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That is interesting and detailed information.

Web apps running in Chrome or Firefox or Safari wont work with any of those solutions though AFAICT. Clients would have to run on the Tor browser to access .onion relays. Which is sensible anyways (using a tor proxy w/o the tor browser is risky).