It looks to me like HTTP/2 can be disabled in Firefox via setting network.http.http2.enabled and network.http.http2.enabled.deps both to false. I tested on htt

It looks to me like HTTP/2 can be disabled in Firefox via setting network.http.http2.enabled and network.http.http2.enabled.deps both to false. I tested on http://www.http2demo.io/ http://www.http2demo.io/ both with and without those settings enabled. The HTTP/2 version doesn't fail when those are disabled, but it shows the same result as the HTTP/1 version. To me this behavior is an argument against Cloudflare more than it's an argument against HTTP/2, but mostly I hope that nobody is tempted to switch to Chrome about it.