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.
Every so often someone posts something on Lemmy or somewhere else which contains a Twitter link that’s interesting or relevant, and so there is value in me visiting it. Just because I don’t “use” Twitter doesn’t mean I don’t end up reading a Twitter post every so often, because other people use it.