Piotr just installed ngx_brotli on my Nginx stack and works nicely in Firefox 44 nightly tests. However, it might have broken ngx_pagespeed support for me in Firefox 44 nightly https://github.com/pagespeed/ngx_pagespeed/issues/1021.

ngx_pagspeed works fine for https on my site with Chrome, Opera and Firefox 43 dev edition as they don't support Brotli so I am assuming Firefox 44 + brotli is what is breaking ngx_pagespeed ?

cheers

George