That only helps so much, some things still won't work if the browser thinks you're talking over an unencrypted connection, like HTTP/2. Technically HTTP/2 allows unencrypted connections (h2c) but as far as I know, no browser implements it (including Tor Browser) and server support is also somewhat limited, so Tor Browser is limited to HTTP/1.[01] on Onion sites unless they have a TLS certificate.