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.
Most of the screenshots I see of Twitter posts aren’t from right wing extremists, but are still ignorant opinions and put-downs presented in an obnoxiously snarky way. The core of toxicity in Twitter isn’t about political affiliation, it’s about mean spirited anti-intellectual tribalism and people using ideals as a pretense to verbally abuse others.