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Oh my. The author put his website on a host ame that includes an underscore: http://_.0xffff.me/dynamodb2022.html

While underscores are valid hostnames per the DNS spec, they are not valid for hostnames in URLs. Firefox honors the HTTP spec and fails the request, but Chrome seems more lenient and displays the page.

To the author. Please put your site on a valid hostname.

Edit: Better explanation: https://stackoverflow.com/a/2183140

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Firefox honors the HTTP spec and fails the request, but Chrome seems more lenient and displays the page.

I just successfully opened this link in Firefox 103.

Doesn't work on the Firefox android app.

Yeah that's what I tested with. Firefox (desktop) works. Firefox mobile (Android) does not.

Works for me on Firefox nightly. One thing to note is that it's HTTP-only site, so if you have some kind of extension/setting to force HTTPS it's not going to work.

It doesn't work with Firefox mobile (Android).

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