Particularly Firefox on Debian testing/9 is affected: it gives a blank page without any error messages. We suspect the issue is: Server negotiated HTTP/2 with blacklisted suite RSA 2048 (SHA256) | TLS 1.2 | TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA | ECDH secp256r1 as reported by https://www.ssllabs.com/ssltest/analyze.html?d=autobuilder.yocto.io
The webserver is updated and the cipher settings modernized. It works for me across multiple browsers so I'm marking resolved. Please reopen if the problem persists for you.