I love Firefox and moved back from Chrome in 2018. But, occasionally there are websites that just don't work in Firefox and work in Chrome/Safari. For example,

I love Firefox and moved back from Chrome in 2018. But, occasionally there are websites that just don't work in Firefox and work in Chrome/Safari. For example, go to https://my.t-mobile.com https://my.t-mobile.com And I will see: 502 Bad Gateway The server returned an invalid or incomplete response. Firefox Web Console reports an error: "The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol." I'm not sure at this point what the issue could be, and why it works for Chrome/Safari. I don't have any extensions that could alter the requests or responses (i.e https everywhere, CORS, etc...)