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It reproduces for me in FF 142 on Windows. When I first went to https://cloudflare-quic.com/ it said HTTP/3, but after a few hard refreshes it says HTTP/2 and hasn't gone back to 3

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Oh, I see - hard refresh consistently shows HTTP/2 but after one or two soft refreshes it becomes HTTP/3 for me until next hard refresh.

Edit: it is always second soft refresh for me that starts showing HTTP/3. Computers work in mysterious ways sometimes.

I restarted FF and am now seeing something similar. Hard refreshing alternates between 2 and 3, and soft refreshes quickly get back to 3 most of the time

For me (FF nightly on Linux) a hard refresh has a roughly 50/50 chance of choosing HTTP3 or HTTP2.

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