Firefox’s Enhanced Tracking Protection (Strict Mode) is known to cause issues on x.com
There were no “issues”; everything was working completely fine. This is a deliberate decision to force people to turn off tracking protection.
I saw a recommendation to use Firefox’s container extension https://support.mozilla.org/en-US/kb/containers, but it’s disabled in private browsing windows, and I always use private browsing windows.
I’ve never had a Twitter account and never felt the need for one, also haven’t been missing out on that junk. I’ve read lots of tweets, on occasions when I was offered a twitter link for whatever, but just never felt like I needed to join up at all. Just seems like a waste of time to get on social media where all the posts are just small bits of opinionated content without much depth.