Important Notice: We're experiencing email notification issues. If you've posted a question in the community forums recently, please check your profile manually for responses while we're working to fix this.

On Monday the 3rd of March, around 5pm UTC (9am PT) users may experience a brief period of downtime while one of our underlying services is under maintenance.

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

HTTP/3 issues

  • 4 replies
  • 0 have this problem
  • 30 views
  • Last reply by Merssedes

more options

Is there a way to force FF to use HTTP/3? There are multiple instances (youtube, for example) when site says "alt-svc: h3", but FF ignores it and keeps using at best HTTP/2.

Is there a way to force FF to use HTTP/3? There are multiple instances (youtube, for example) when site says "alt-svc: h3", but FF ignores it and keeps using at best HTTP/2.

All Replies (4)

more options

Hi

As a first step, I recommend updating your copy of Firefox as you appear to be using an older version.

Does this help fix the problem?

more options

You mean 128.0.3? Same problem.

more options

Enter about:config in the address bar and confirm that network.http.http3.enable = true.

more options

TyDraniu said

Enter about:config in the address bar and confirm that network.http.http3.enable = true.

Confirmed.