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DoH not working in Firefox 89

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I’m using DNS over HTTPS in Firefox 89. Unfortunately it appears that https://www.cloudflare.com/ssl/encrypted-sni/ shows that DoH is not being used despite me enabling it in the settings and setting network.trr.mode to 3.

For instance if I do the same test on Chrome it shows that DoH is working, but not on Firefox for some reason.

https://1.1.1.1/help#eyJpc0NmIjoiTm8iLCJpc0RvdCI6Ik5vIiwiaXNEb2giOiJObyIsInJlc29sdmVySXAtMS4xLjEuMSI6IlllcyIsInJlc29sdmVySXAtMS4wLjAuMSI6IlllcyIsInJlc29sdmVySXAtMjYwNjo0NzAwOjQ3MDA6OjExMTEiOiJObyIsInJlc29sdmVySXAtMjYwNjo0NzAwOjQ3MDA6OjEwMDEiOiJObyIsImRhdGFjZW50ZXJMb2NhdGlvbiI6IkJPTSIsImlzV2FycCI6Ik5vIiwiaXNwTmFtZSI6IkNsb3VkZmxhcmUiLCJpc3BBc24iOiIxMzMzNSJ9

I’m using DNS over HTTPS in Firefox 89. Unfortunately it appears that https://www.cloudflare.com/ssl/encrypted-sni/ shows that DoH is not being used despite me enabling it in the settings and setting network.trr.mode to 3. For instance if I do the same test on Chrome it shows that DoH is working, but not on Firefox for some reason. https://1.1.1.1/help#eyJpc0NmIjoiTm8iLCJpc0RvdCI6Ik5vIiwiaXNEb2giOiJObyIsInJlc29sdmVySXAtMS4xLjEuMSI6IlllcyIsInJlc29sdmVySXAtMS4wLjAuMSI6IlllcyIsInJlc29sdmVySXAtMjYwNjo0NzAwOjQ3MDA6OjExMTEiOiJObyIsInJlc29sdmVySXAtMjYwNjo0NzAwOjQ3MDA6OjEwMDEiOiJObyIsImRhdGFjZW50ZXJMb2NhdGlvbiI6IkJPTSIsImlzV2FycCI6Ik5vIiwiaXNwTmFtZSI6IkNsb3VkZmxhcmUiLCJpc3BBc24iOiIxMzMzNSJ9