How to fix Firefox if you're having trouble today :

  1. Kill the running Firefox process (through your favourite task manager, htop, whatever)
  2. Access about:config
  3. Search for network.http.http3.enabled and set it to false
  4. Close Firefox and kill it again
  5. Launch Firefox
  6. Enjoy

If you'd like to follow developments on this the Firefox bug seems to be this one : bugzilla.mozilla.org/show_bug.

Someone from Firefox posted :

Our current suspicion is that Google Cloud Load Balancer (or a similar CloudFlare service) that fronts one of our own servers got an update that triggers an existing HTTP3 bug. Telemetry was first implicated because it's one of the first services a normal Firefox configuration will connect first, but presumably the bug will trigger with any other connection to such a server.

Our current plan is to disable HTTP3 to mitigate until we can locate the exact bug in the networking stack.

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This means that disabling Firefox telemetry might not be enough to resolve the issue if you access other HTTP/3-enabled services.

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