Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

TLS Extensions 65037 during client hello since firefox 118 (Windows)

  • 4 uphendule
  • 0 zinale nkinga
  • 315 views
  • Igcine ukuphendulwa ngu Lukasz

more options

Hello,

I see with windows Firefox version 118 a TLS extension id 65037 on every client hello handshake containing a bunch of data. Does somebody know what this extension is used for? I couldn't find anything about this on the web or in the firefox docs / release notes. Other browser (chrome / edge) don't have this extension in use.

Thanks

Hello, I see with windows Firefox version 118 a TLS extension id 65037 on every client hello handshake containing a bunch of data. Does somebody know what this extension is used for? I couldn't find anything about this on the web or in the firefox docs / release notes. Other browser (chrome / edge) don't have this extension in use. Thanks
Ama-screenshot ananyekiwe

Isisombululo esikhethiwe

That is Encrypted Client Hello (ECH), it will go away if you change security.tls.ech.grease_probability to 0 in about:config. Chrome has it behind a flag.

Funda le mpendulo ngokuhambisana nalesi sihloko 👍 2

All Replies (4)

more options

Isisombululo Esikhethiwe

That is Encrypted Client Hello (ECH), it will go away if you change security.tls.ech.grease_probability to 0 in about:config. Chrome has it behind a flag.

more options

On Linux firefox 118 doesn't have this extension in use.

more options

It's a limited rollout, you can see them listed in about:support#remote-features.

more options

zeroknight said

That is Encrypted Client Hello (ECH), it will go away if you change security.tls.ech.grease_probability to 0 in about:config. Chrome has it behind a flag.

Thank you for clarification.