I'm running KDE/Plasma Arm64 for the Pinebook Pro. Package Firefox 78.0-1 which was released earlier today fails loading anything from web servers using http/2, failing with NS_ERROR_NET_INADEQUATE_SECURITY, even when the web server in question offers only high security TLS1.2 and TLS1.3 ciphersuites. It's as if the package contains a broken "cipher blacklist" or as if it refuses to downgrade to http/1.1.
The workaround for now was that I disabled http/2 by changing
network.http.spdy.enabled.http2 in the config.