All: please submit the original source and then add a link to alt sources in the comments.
I know the twitwall is frustrating (it is to us too) but we want HN posts to link to original sources, and for the site name to the right of the title to reflect that. This is in the site guidelines: https://news.ycombinator.com/newsguidelines.html.
We're happy to pin the alt links to the top of a thread and/or to move them into the top text, as I did in the current case.
x.com isn't even accessible from Firefox. It tries to trick you into turning off enhanced tracking protection claiming it is "known to cause issues" (the "issues" presumably being with them invading your privacy).
I just accessed x.com from Firefox 143.0.1, and there was no such message or claim. It just displayed the site without any warning or ceremony. I have not visited the site with this browser before.