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.
tbh as a trans person, facebook groups are pretty great. i’ve been some awesome trans people there that i still communicate with. also there’s a good book community in groups too. groups are great at isolating you from the weird conspiracy theory public content in comments.