Firefox 137.0.1 on Ubuntu 24.04 fails to load vencord.dev with PR_END_OF_FILE_ERROR

       Other browsers (Chrome, curl) work fine

       Same error in Safe Mode

   What I checked:

       SSL cert is valid (openssl shows no issues)

       Reinstalled Firefox completely

       Reset profile, updated CA certs

       No extensions installed

   Technical details:

       TLS_AES_256_GCM_SHA384 cipher

       ECDSA-SHA256 signature

       Verification shows OK (code 0)

   Need help with:

       How to debug this specific TLS termination

       Where to find relevant Firefox logs

       Known issues with Firefox 137 and ECDSA

   Can provide:

       Full openssl output

       Firefox debug logs

       Packet captures if needed

   Quick test:
   curl works:
   curl -v https://vencord.dev
   Firefox fails even in headless:
   firefox --headless https://vencord.dev

   Tried forcing TLS 1.2:
   NSS_SECURITY_ARGS="version=tls1.2" firefox https://vencord.dev
   Same error

Problem: Firefox 137.0.1 on Ubuntu 24.04 fails to load vencord.dev with PR_END_OF_FILE_ERROR Other browsers (Chrome, curl) work fine Same error in Safe Mode What I checked: SSL cert is valid (openssl shows no issues) Reinstalled Firefox completely Reset profile, updated CA certs No extensions installed Technical details: TLS_AES_256_GCM_SHA384 cipher ECDSA-SHA256 signature Verification shows OK (code 0) Need help with: How to debug this specific TLS termination Where to find relevant Firefox logs Known issues with Firefox 137 and ECDSA Can provide: Full openssl output Firefox debug logs Packet captures if needed Quick test: curl works: curl -v https://vencord.dev Firefox fails even in headless: firefox --headless https://vencord.dev Tried forcing TLS 1.2: NSS_SECURITY_ARGS="version=tls1.2" firefox https://vencord.dev Same error