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.
Wait, I thought the “downside” of this app was that it used your VPN connection, compared to NextDNS or the built in DNS feature of Android.
I also use AdAway rooted version and not really looking into changing it, but if you could clarify about this I could happily see it as an alternative :)