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Problems with FF ESR resulting from http2 and SSL

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Since my website (https://www.der-bank-blog.de) is configured to http2, users using FF ESR cannot access anymore. They just see a blank screen.

Other browsers and "normal" FF are working fine.

I seems to stay in connection with the cipher Suite. https://bugzilla.mozilla.org/show_bug.cgi?id=975832

User could workarround by changing "aes_256" in the about:config view.

But I need a solution for the backend to avoid loosing users, trying to reach the site e.g. via Google Search.

Any ideas are greatly apreciated

Cheers from Germany

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Blank page confirmed using ESR 45.7.0

Site opens properly using Win IE.

I called for more help.

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I have to disable security.ssl3.ecdhe_rsa_aes_128_gcm_sha256 (false) to make Firefox open the page, so you would have to disable this cipher suites on the server to make it work in Firefox 45 ESR.

Tools -> Page Info -> Secrity shows:

Connection Encrypted (TLS_RSA_WITH_AES_256_CBC_SHA, 256 bit keys, TLS 1.2)

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